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Treasury Stock and Share Based Awards (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 Y | Mar. 31, 2011
Share-Based Compensation Arrangement by Share-Based Payment Award (Textual) [Abstract] |  |
Average remaining contractual life of options outstanding | 3 |
Fair value of restricted stock granted | $ 21.63 |
Compensation expense recognition period (in years) | 3 |
Number of hypothetical shares of common stock | 152,955 |
Fourth anniversary of grant date | Mar. 31, 2015 |
Number of Restricted Stock Units Forfeited | 0 |
Compensation expense | $ 781 | $ 698
Actual cumulative forfeitures (in units) | 19,918 |
Assumed maximum IRR for all grants | 12.50% |
Tax benefit recognized on vested shares | 1,067 |
Treasury Stock and Share Based Awards (Textual) [Abstract] |  |
Market value of restricted shares withheld minimum | $ 21.95 |
Market value of restricted shares withheld maximum | $ 22.40 |
Intrinsic value of options exercised | 3 |
Shares of Restricted Stock Granted | 618,230 |
Minimum forfeiture rate for restricted stock awards | 0.00% |
Maximum forfeiture rate for restricted stock awards | 5.00% |
Total fair value of vested shares | 7,636 |
Tax benefit recognized on vested shares | 1,067 |
Unrecognized Compensation expense related to restricted stock awards | 24,996 |
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% |
Minimum fair value of restricted stock granted | $ 21.63 |
Assumed forfeiture rate of restricted stock unit awards | 5.00% |
Compensation expense related to restricted stock awards | 2,534 | 1,315
Number of restricted units vested during period | 113,456 |
Restricted Stock [Member] |  |
Share-Based Compensation Arrangement by Share-Based Payment Award (Textual) [Abstract] |  |
Fair value of restricted stock granted | $ 21.63 |
Award vesting period range for remaining restricted stock granted | Over 4 Years |
Award vesting period range for restricted stock granted | Over 3 years |
Restricted Stock Units [Member] |  |
Share-Based Compensation Arrangement by Share-Based Payment Award (Textual) [Abstract] |  |
Unrecognized Compensation expense related to outstanding stock options | 6,153 |
Compensation expense recognition period (in years) | 2 |
Number of hypothetical shares of common stock | 1,077,269 |
Total dividend paid | 346 |
Fair value of the restricted stock unit awards, vested | 2,541 |
Tax benefit recognized on vested shares | 2,863 |
Treasury Stock and Share Based Awards (Textual) [Abstract] |  |
Tax benefit recognized on vested shares | $ 2,863 |
at IRR of at least 8.5% [Member] |  |
Share-Based Compensation Arrangement by Share-Based Payment Award (Textual) [Abstract] |  |
Percentage of restricted stock units vest | 33.00% |
at IRR of at least 10.5% [Member] |  |
Share-Based Compensation Arrangement by Share-Based Payment Award (Textual) [Abstract] |  |
Percentage of restricted stock units vest | 66.00% |
at IRR of at least 12.5% [Member] |  |
Share-Based Compensation Arrangement by Share-Based Payment Award (Textual) [Abstract] |  |
Percentage of restricted stock units vest | 100.00% |

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