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Treasury Stock and Share Based Awards (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified | 6 Months Ended
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Jun. 30, 2012 | Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Fair value of restricted stock granted | $ 21.63 |
Compensation expense recognition period (in years) | 3 years |
Treasury Stock and Share Based Awards (Textual) [Abstract] |  |
Market value of restricted shares withheld minimum | $ 21.95 |
Market value of restricted shares withheld maximum | $ 22.50 |
Intrinsic value of options exercised | $ 3 |
Average remaining contractual life of options outstanding | 2 years |
Shares of restricted stock, granted | 622,758 |
Minimum forfeiture rates for restricted stock awards | 0.00% |
Maximum forfeiture rates for restricted stock awards | 5.00% |
Total fair value of vested shares | 9,938 |
Tax benefit recognized on vested shares | 3,693 |
Unrecognized Compensation expense related to restricted stock awards | 22,771 |
Compensation expense recognition period (in years) | 3 years |
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 | 5,397 | 3,074
Number of restricted units vested during period | 196,051 |
Actual cumulative forfeitures (in units) | 11,608 |
Assumed maximum IRR for all grants | 12.50% |
Maximum [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Fair value of restricted stock granted | $ 21.63 |
Minimum [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Fair value of restricted stock granted |  | $ 22.08
Restricted stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total dividends paid on restricted stock units that vested during period | 600 |
Fair value of the restricted stock unit awards, vested | 4,400 |
Tax benefit recognized on vested restricted stock units | 1,848 |
Restricted stock [Member] | Maximum [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award vesting period range for restricted stock granted | 4 years |
Restricted stock [Member] | Minimum [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award vesting period range for restricted stock granted | 3 years |
Restricted Stock Units [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of hypothetical shares of common stock, stock issued to employees | 152,955 |
Number of hypothetical shares of common stock, stock issued at IRR level | 994,674 |
Fourth anniversary of grant date | Mar. 31, 2015 |
Restricted stock unit awards forfeited in period | 0 |
Unrecognized Compensation Expense for Outstanding Options | 5,550 |
Compensation expense recognition period (in years) | 2 years |
Treasury Stock and Share Based Awards (Textual) [Abstract] |  |
Compensation expense recognition period (in years) | 2 years |
Restricted Stock Units [Member] | Maximum [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Compensation expense related to restricted units awards |  | 1,498
Restricted Stock Units [Member] | Minimum [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Compensation expense related to restricted units awards | $ 1,471 |

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