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Basis of Presentation (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Reconciliation of basic earnings per share ("EPS") to diluted EPS
Net income available to common stockholders	$ 12,976	$ 4,949	$ 19,380	$ 36,036	$ 45,951
Basic weighted average shares outstanding	48,346		48,253	48,322	49,247
Dilutive effect of potential common stock equivalents - stock options (in shares)	44		35	63	49
Diluted weighted average shares outstanding	48,390		48,288	48,385	49,296
Earnings per common share - basic:
Basic (in dollars per share)	$ 0.27		$ 0.40	$ 0.75	$ 0.93
Earnings per common share - diluted:
Diluted (in dollars per share)	$ 0.27		$ 0.40	$ 0.74	$ 0.93
Potentially dilutive securities excluded from earnings per diluted share because their effect is anti-dilutive (in shares)	1,709		1,752	1,714	1,746

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