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Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share [Abstract]        
Income from continuing operations for calculating basic and diluted earnings per share $ 23,141 $ 19,636 $ 59,068 $ 53,421
Loss from discontinued operations 0 (747) 0 (671)
Net income $ 23,141 $ 18,889 $ 59,068 $ 52,750
Weighted-average common shares for calculating basic earnings per share 28,904 28,616 29,128 28,951
Stock options, warrants and nonvested awards 449 814 509 778
Weighted-average common shares for calculating diluted earnings per share 29,353 29,430 29,637 29,729
Income from continuing operations (basic) (in dollars per share) $ 0.80 $ 0.69 $ 2.03 $ 1.85
Income from discontinued operations (basic) (in dollars per share) $ 0.00 $ (0.03) $ 0.00 $ (0.03)
Net income per basic share (in dollars per share) $ 0.80 $ 0.66 $ 2.03 $ 1.82
Income from continuing operations (diluted) (in dollars per share) $ 0.79 $ 0.67 $ 1.99 $ 1.80
Income from discontinued operations (diluted) (in dollars per share) $ 0.00 $ (0.03) $ 0.00 $ (0.03)
Net income per diluted share (in dollars per share) $ 0.79 $ 0.64 $ 1.99 $ 1.77