| Activity in stock option plans |
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Options |
|
Weighted-average
Exercise Price |
|
Weighted-
average
Remaining
Contractual
Life
(in years) |
|
Aggregate
Intrinsic
Value |
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|
Balance at December 31, 2008
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440,080 |
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$ |
16.14 |
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Granted
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598,510 |
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|
25.31 |
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Exercised
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(117,830 |
) |
|
14.66 |
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Forfeited
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(3,530 |
) |
|
25.05 |
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Expired
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(20,400 |
) |
|
10.63 |
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| |
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Balance at December 31, 2009
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896,830 |
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$ |
22.55 |
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Granted
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387,250 |
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62.74 |
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Exercised
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(195,530 |
) |
|
17.36 |
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Forfeited
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(8,555 |
) |
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41.54 |
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Expired
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(6,400 |
) |
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9.33 |
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| |
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Balance at December 31, 2010
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1,073,595 |
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$ |
37.92 |
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Granted
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316,159 |
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|
115.71 |
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Exercised
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(134,520 |
) |
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23.93 |
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Forfeited
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(12,197 |
) |
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57.68 |
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| |
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Balance at December 31, 2011
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1,243,037 |
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$ |
59.02 |
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|
7.29 |
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$ |
45,224,497 |
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| |
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Exercisable, December 31, 2009
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376,450 |
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$ |
18.50 |
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4.82 |
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$ |
10,709,436 |
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Exercisable, December 31, 2010
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222,110 |
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$ |
26.36 |
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5.40 |
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$ |
18,683,972 |
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Exercisable, December 31, 2011
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721,210 |
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$ |
38.75 |
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6.25 |
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$ |
37,526,500 |
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| Weighted-average grant date fair value of performance and restricted shares |
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Performance Shares |
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Restricted Shares |
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Shares |
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Weighted-average
Fair Value |
|
Shares |
|
Weighted-average
Fair Value |
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Nonvested at December 31, 2008
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2,206,486 |
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$ |
32.98 |
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|
138,130 |
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$ |
27.51 |
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Granted
|
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|
440,168 |
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|
31.67 |
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— |
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— |
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Vested
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(1,382,720 |
) |
|
25.34 |
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(68,264 |
) |
|
27.33 |
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Forfeited
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(50,548 |
) |
|
47.40 |
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— |
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— |
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Nonvested at December 31, 2009
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1,213,386 |
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$ |
40.63 |
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69,866 |
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$ |
27.68 |
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Granted
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186,947 |
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60.92 |
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68,290 |
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52.16 |
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Vested
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(704,931 |
) |
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38.62 |
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(68,266 |
) |
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27.33 |
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Cancelled
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(200,324 |
) |
|
56.53 |
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— |
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— |
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Forfeited
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(13,307 |
) |
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30.98 |
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— |
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— |
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Nonvested at December 31, 2010
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481,771 |
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$ |
45.10 |
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69,890 |
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$ |
51.94 |
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Granted
|
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|
229,436 |
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|
86.65 |
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|
13,555 |
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|
108.51 |
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Vested
|
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(178,653 |
) |
|
48.03 |
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(1,600 |
) |
|
42.61 |
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Forfeited
|
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(7,163 |
) |
|
59.15 |
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— |
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— |
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| |
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Nonvested at December 31, 2011
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525,391 |
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$ |
62.05 |
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81,845 |
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$ |
61.49 |
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