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Equity Compensation Plans and Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Compensation, Shares Authorized under Stock Option and Warrant Plans, by Exercise Price Range | options outstanding as of December 31, 2012, are as follows (in thousands, except exercise price and life):
Range of |  |  |  | Weighted-Average |  | Currently
Exercise Prices |  | Options |  | Remaining Life |  | Exercisable
$ | 10.00 |  | - | $ | 15.00 |  |  |  | 400 |  |  |  | 3.1 |  |  | 380 |  |
$ | 15.01 |  | - | $ | 20.00 |  |  |  | 1,120 |  |  |  | 2.5 |  |  | 1,120 |  |
$ | 20.01 |  | - | $ | 25.00 |  |  |  | 25 |  |  |  | 4.3 |  |  | 12 |  |
$ | 35.01 |  | - | $ | 40.00 |  |  |  | 90 |  |  |  | 8.4 |  |  | — |  |
|  |  |  |  | 1,635 |  |  |  | 3.0 |  |  | 1,512 |  |
Schedule of Stock Options Activity | A summary of stock option activity for the years ended December 31, 2012, 2011 and 2010, is as follows (in thousands, except exercise price):
| 2012 |  | 2011 |  | 2010
|  |  | Weighted- |  |  |  | Weighted- |  |  |  | Weighted-
|  |  | Average |  |  |  | Average |  |  |  | Average
| Underlying |  | Exercise |  | Underlying |  | Exercise |  | Underlying |  | Exercise
| Shares |  | Price |  | Shares |  | Price |  | Shares |  | Price
Outstanding at beginning of year | 2,109 |  |  | $ | 16.39 |  |  | 2,292 |  |  | $ | 14.63 |  |  | 3,567 |  |  | $ | 14.25 |
Granted | — |  |  | — |  |  | 90 |  |  | 39.11 |  |  | — |  |  | — |
Exercised | (474 | ) |  | 9.06 |  |  | (273 | ) |  | 9.08 |  |  | (1,275 | ) |  | 13.57 |
Outstanding at end of year | 1,635 |  |  | 18.51 |  |  | 2,109 |  |  | 16.39 |  |  | 2,292 |  |  | 14.63 |
Exercisable at end of year | 1,512 |  |  | 17.35 |  |  | 1,950 |  |  | 15.48 |  |  | 2,180 |  |  | 15.27 |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | The Company's net income includes the following compensation costs related to share-based compensation arrangements (in thousands):
| Year Ended December 31,
| 2012 |  | 2011 |  | 2010
Gross compensation costs: |  |  |  |  |
Stock options | $ | 134 |  |  | $ | 112 |  |  | $ | 91 |
Nonvested stock | 1,166 |  |  | 630 |  |  | 915 |
Total gross compensation costs | 1,300 |  |  | 742 |  |  | 1,006 |
Income tax benefits: |  |  |  |  |
Stock options | (45 | ) |  | (39 | ) |  | (33 | )
Nonvested stock | (217 | ) |  | (217 | ) |  | (328 | )
Total income tax benefits | (262 | ) |  | (256 | ) |  | (361 | )
Net compensation expense | $ | 1,038 |  |  | $ | 486 |  |  | $ | 645 |
Tax benefit realized from stock options exercised during the year | $ | 5,841 |  |  | $ | 2,088 |  |  | $ | 6,154 |
Nonvested stock |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Nonvested Stock Options Acitivity | The following table summarizes the nonvested common stock award activity during 2012, 2011 and 2010 (in thousands, except fair value amounts):
| 2012 |  | 2011 |  | 2010
|  |  | Weighted- |  |  |  | Weighted- |  |  |  | Weighted-
|  |  | Average |  |  |  | Average |  |  |  | Average
|  |  | Fair Value |  |  |  | Fair Value |  |  |  | Fair Value
| Underlying |  | at Date |  | Underlying |  | at Date |  | Underlying |  | at Date
| Shares |  | of Grant |  | Shares |  | of Grant |  | Shares |  | of Grant
Outstanding at beginning of year | 76 |  |  | $ | 30.74 |  |  | 33 |  |  | $ | 28.50 |  |  | — |  |  | $ | — |
Granted | 108 |  |  | 43.45 |  |  | 59 |  |  | 31.59 |  |  | 63 |  |  | 28.50 |
Vested | (31 | ) |  | 33.04 |  |  | (16 | ) |  | 29.26 |  |  | (30 | ) |  | 28.50 |
Outstanding at end of year | 153 |  |  | 39.24 |  |  | 76 |  |  | 30.74 |  |  | 33 |  |  | 28.50 |

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