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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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