Earnings Per Share Table (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share [Abstract]
Income from continuing operations for calculating basic and diluted earnings per share	$ 19,636	$ 18,252	$ 53,421	$ 49,307
Income (loss) from discontinued operations	(747)	181	(671)	7,020
Net income	$ 18,889	$ 18,433	$ 52,750	$ 56,327
Weighted-average common shares for calculating basic earnings per share	28,616	30,348	28,951	30,915
Stock options, warrants and nonvested awards	814	847	778	798
Weighted-average common shares for calculating diluted earnings per share	29,430	31,195	29,729	31,713
Income from continuing operations (basic)	$ 0.69	$ 0.60	$ 1.85	$ 1.59
Income (loss) from discontinued operations (basic)	$ (0.03)	$ 0.00	$ (0.03)	$ 0.23
Net income per basic share	$ 0.66	$ 0.60	$ 1.82	$ 1.82
Income from continuing operations (diluted)	$ 0.67	$ 0.58	$ 1.80	$ 1.55
Income (loss) from discontinued operations (diluted)	$ (0.03)	$ 0.01	$ (0.03)	$ 0.23
Net income per diluted share	$ 0.64	$ 0.59	$ 1.77	$ 1.78

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