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Treasury Stock and Share Based Awards (Textuals) (USD $) In Thousands, except Share data, unless otherwise specified | 6 Months Ended
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Jun. 30, 2011 | Jun. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award (Textuals) [Abstract] |  |
Assumed forfeiture rate of restricted stock unit awards | 5.00% |
Number of hypothetical shares of common stock | 153,727 |
Treasury Stock and Share Based Awards (Textuals) [Abstract] |  |
Common Stock Repurchased Value As Result Of Restricted Stock Forfeitures | $ 0.001 |
Market Value Of Restricted Shares | $ 19.60 |
Intrinsic value of options exercised | $ 699 |
Recognized tax benefit on options exercised | 238 |
Average remaining contractual life of options outstanding | 3 |
Shares of Restricted Stock Granted | 424,436 |
Minimum fair value of restricted stock granted | $ 19.35 |
Maximum fair value of restricted stock granted | $ 20.71 |
Minimum forfeiture rate for restricted stock awards | 0.00% |
Maximum forfeiture rate for restricted stock awards | 5.00% |
Award vesting period range for restricted stock granted to directors | Over one year |
Award vesting period range for restricted stock granted to employees | 4 |
Compensation expense related to restricted stock awards | 3,074 | 2,134
Unrecognized Compensation expense related to restricted stock awards | 17,205 |
Compensation expense recognition period (in years) | 3 |
Total fair value of vested shares | 5,658 |
Tax benefit recognized on vested shares | 2,188 |
Market value of common stock on the date of grant | $ 19.35 |
Fourth anniversary of grant date | Mar. 31, 2015 |
Percentage of IRR, which is the threshold | 8.50% |
Percentage of IRR, which is the target | 10.50% |
Percentage of IRR, which is the maximum | 12.50% |
IRR Target Label One [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award (Textuals) [Abstract] |  |
Percentage of restricted stock units vest | 33.00% |
IRR Target Label Two [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award (Textuals) [Abstract] |  |
Percentage of restricted stock units vest | 66.00% |
IRR Target Label Three [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award (Textuals) [Abstract] |  |
Percentage of restricted stock units vest | 100.00% |
Restricted Stock Units [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award (Textuals) [Abstract] |  |
Number of Restricted Units Vested During Period | 0 |
Shares of Restricted Stock Forfeited | 0 |
Compensation expense | 1,498 | 1,120
Actual cumulative forfeitures (in units) | 19,918 |
Assumed maximum IRR for all grants | 12.50% |
Compensation expense recognition period (in years) | 2 |
Unrecognized Compensation expense related to outstanding stock options | 6,816 |
Number of hypothetical shares of common stock | 1,037,770 |
Employee Stock Option [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award (Textuals) [Abstract] |  |
Unrecognized Compensation expense related to outstanding stock options | $ 0 |

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