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Basis of Presentation (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Dec. 31, 2011 | Jun. 30, 2011
Reconciliation of basic earnings per share ("EPS") to diluted EPS |  |  |  |  |
Net income available to common stockholders | $ 15,859 | $ 19,493 | $ 23,060 | $ 24,329 | $ 26,571
Basic weighted average shares outstanding | 48,340 | 49,404 | 48,307 |  | 49,753
Dilutive effect of potential common stock equivalents - stock options (in shares) | 79 | 52 | 71 |  | 56
Diluted weighted average shares outstanding | 48,419 | 49,456 | 48,378 |  | 49,809
Earnings per common share - basic: |  |  |  |  |
Basic (in dollars per share) | $ 0.33 | $ 0.39 | $ 0.48 |  | $ 0.53
Earnings per common share - diluted: |  |  |  |  |
Diluted (in dollars per share) | $ 0.33 | $ 0.39 | $ 0.48 |  | $ 0.53
Potentially dilutive securities excluded from earnings per diluted share because their effect is anti-dilutive (in shares) | 1,711 | 1,743 | 1,711 |  | 1,743

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