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Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accounting Policies [Abstract]                      
Income from continuing operations for calculating basic and diluted earnings per share $ 27,684 $ 19,636 $ 16,333 $ 17,452 $ 21,216 $ 18,252 $ 15,179 $ 15,876 $ 81,105 $ 70,523 $ 51,302
Income (loss) from discontinued operations (75) (747) 16 60 239 181 159 6,680 (746) 7,259 6,356
Net income $ 27,609 $ 18,889 $ 16,349 $ 17,512 $ 21,455 $ 18,433 $ 15,338 $ 22,556 $ 80,359 $ 77,782 $ 57,658
Weighted-average common shares for calculating basic earnings per share                 28,912 30,706 30,266
Stock options, warrants and nonvested awards                 801 792 792
Weighted-average common shares for calculating diluted earnings per share 29,666 29,430 29,404 30,353 30,854 31,195 31,869 32,075 29,713 31,498 31,058
Income from continuing operations (basic) (in dollars per share)                 $ 2.81 $ 2.30 $ 1.69
Income (loss) from discontinued operations (basic) (in dollars per share)                 $ (0.03) $ 0.23 $ 0.21
Net income per basic share (in dollars per share)                 $ 2.78 $ 2.53 $ 1.90
Income from continuing operations (diluted) (in dollars per share) $ 0.93 $ 0.67 $ 0.56 $ 0.57 $ 0.69 $ 0.58 $ 0.48 $ 0.49 $ 2.73 $ 2.24 $ 1.65
Income (loss) from discontinued operations (diluted) (in dollars per share) $ 0.00 $ (0.03) $ 0.00 $ 0.01 $ 0.01 $ 0.01 $ 0.00 $ 0.21 $ (0.03) $ 0.23 $ 0.21
Net income per diluted share (in dollars per share) $ 0.93 $ 0.64 $ 0.56 $ 0.58 $ 0.70 $ 0.59 $ 0.48 $ 0.70 $ 2.70 $ 2.47 $ 1.86