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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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounting Policies [Abstract]                      
Income from continuing operations for calculating basic and diluted earnings per share $ 25,518 $ 23,127 $ 15,654 $ 20,180 $ 27,612 $ 19,578 $ 16,297 $ 17,375 $ 84,479 $ 80,862 $ 70,137
Income (loss) from discontinued operations (740) 14 9 84 (3) (689) 52 137 (633) (503) 7,645
Net income $ 24,778 $ 23,141 $ 15,663 $ 20,264 $ 27,609 $ 18,889 $ 16,349 $ 17,512 $ 83,846 $ 80,359 $ 77,782
Weighted-average common shares for calculating basic earnings per share                 29,079 28,912 30,706
Stock options, warrants and nonvested awards                 495 801 792
Weighted-average common shares for calculating diluted earnings per share 29,393 29,353 29,603 29,955 29,666 29,430 29,404 30,353 29,574 29,713 31,498
Income from continuing operations (basic) (in dollars per share)                 $ 2.91 $ 2.80 $ 2.29
Income (loss) from discontinued operations (basic) (in dollars per share)                 $ (0.02) $ (0.02) $ 0.24
Net income per basic share (in dollars per share)                 $ 2.89 $ 2.78 $ 2.53
Income from continuing operations (diluted) (in dollars per share) $ 0.87 $ 0.79 $ 0.53 $ 0.68 $ 0.93 $ 0.67 $ 0.56 $ 0.57 $ 2.86 $ 2.72 $ 2.23
Income (loss) from discontinued operations (diluted) (in dollars per share) $ (0.03) $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ (0.03) $ 0.00 $ 0.01 $ (0.02) $ (0.02) $ 0.24
Net income per diluted share (in dollars per share) $ 0.84 $ 0.79 $ 0.53 $ 0.68 $ 0.93 $ 0.64 $ 0.56 $ 0.58 $ 2.84 $ 2.70 $ 2.47