| Activity in stock option plans |
|
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|
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|
Options |
|
Weighted-average
Exercise Price |
|
Weighted-
average
Remaining
Contractual
Life
(in years) |
|
Aggregate
Intrinsic
Value |
|
|
Balance at December 31, 2009
|
|
|
896,830 |
|
$ |
22.55 |
|
|
|
|
|
|
|
Granted
|
|
|
387,250 |
|
|
62.74 |
|
|
|
|
|
|
|
Exercised
|
|
|
(195,530 |
) |
|
17.36 |
|
|
|
|
|
|
|
Forfeited
|
|
|
(8,555 |
) |
|
41.54 |
|
|
|
|
|
|
|
Expired
|
|
|
(6,400 |
) |
|
9.33 |
|
|
|
|
|
|
| |
|
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|
|
|
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Balance at December 31, 2010
|
|
|
1,073,595 |
|
|
37.92 |
|
|
|
|
|
|
|
Granted
|
|
|
316,159 |
|
|
115.71 |
|
|
|
|
|
|
|
Exercised
|
|
|
(134,520 |
) |
|
23.93 |
|
|
|
|
|
|
|
Forfeited
|
|
|
(12,197 |
) |
|
57.68 |
|
|
|
|
|
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| |
|
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|
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|
|
|
|
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|
Balance at December 31, 2011
|
|
|
1,243,037 |
|
|
59.02 |
|
|
|
|
|
|
|
Granted
|
|
|
321,945 |
|
|
119.34 |
|
|
|
|
|
|
|
Exercised
|
|
|
(241,815 |
) |
|
31.73 |
|
|
|
|
|
|
|
Forfeited
|
|
|
(13,999 |
) |
|
67.86 |
|
|
|
|
|
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| |
|
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|
|
|
|
|
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|
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|
Balance at December 31, 2012
|
|
|
1,309,168 |
|
$ |
78.80 |
|
7.30 |
|
$ |
44,192,177 |
|
| |
|
|
|
|
|
|
|
|
|
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|
Exercisable, December 31, 2010
|
|
|
222,110 |
|
$ |
26.36 |
|
5.40 |
|
$ |
18,683,972 |
|
|
Exercisable, December 31, 2011
|
|
|
721,210 |
|
$ |
38.75 |
|
6.25 |
|
$ |
37,526,500 |
|
|
Exercisable, December 31, 2012
|
|
|
785,869 |
|
$ |
51.40 |
|
6.26 |
|
$ |
44,176,663 |
|
|
| Weighted-average grant date fair value of performance and restricted shares |
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|
Performance Shares |
|
Restricted Shares |
|
|
|
Shares |
|
Weighted-average
Fair Value |
|
Shares |
|
Weighted-average
Fair Value |
|
|
Nonvested at December 31, 2009
|
|
|
1,213,386 |
|
$ |
40.63 |
|
|
69,866 |
|
$ |
27.68 |
|
|
Granted
|
|
|
186,947 |
|
|
60.92 |
|
|
68,290 |
|
|
52.16 |
|
|
Vested
|
|
|
(704,931 |
) |
|
38.62 |
|
|
(68,266 |
) |
|
27.33 |
|
|
Cancelled
|
|
|
(200,324 |
) |
|
56.53 |
|
|
— |
|
|
— |
|
|
Forefeited
|
|
|
(13,307 |
) |
|
30.98 |
|
|
— |
|
|
— |
|
| |
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|
Nonvested at December 31, 2010
|
|
|
481,771 |
|
|
45.10 |
|
|
69,890 |
|
|
51.94 |
|
|
Granted
|
|
|
229,436 |
|
|
86.65 |
|
|
13,555 |
|
|
108.51 |
|
|
Vested
|
|
|
(178,653 |
) |
|
48.03 |
|
|
(1,600 |
) |
|
42.61 |
|
|
Forfeited
|
|
|
(7,163 |
) |
|
59.15 |
|
|
— |
|
|
— |
|
| |
|
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|
|
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|
Nonvested at December 31, 2011
|
|
|
525,391 |
|
|
62.05 |
|
|
81,845 |
|
|
61.49 |
|
|
Granted
|
|
|
325,590 |
|
|
89.92 |
|
|
3,150 |
|
|
91.68 |
|
|
Vested
|
|
|
(194,484 |
) |
|
25.46 |
|
|
(22,766 |
) |
|
52.16 |
|
|
Forfeited
|
|
|
(26,413 |
) |
|
91.94 |
|
|
— |
|
|
— |
|
| |
|
|
|
|
|
|
|
|
|
|
Nonvested at December 31, 2012
|
|
|
630,084 |
|
$ |
86.49 |
|
|
62,229 |
|
$ |
66.43 |
|
| |
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|