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Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share [Abstract]        
Income from continuing operations for calculating basic and diluted earnings per share $ 16,015 $ 15,654 $ 38,969 $ 35,834
Income (loss) from discontinued operations 0 9 (272) 93
Net income $ 16,015 $ 15,663 $ 38,697 $ 35,927
Weighted-average common shares for calculating basic earnings per share 28,938 29,167 28,945 29,240
Stock options and nonvested awards 403 436 396 539
Weighted-average common shares for calculating diluted earnings per share 29,341 29,603 29,341 29,779
Income from continuing operations (basic) (in dollars per share) $ 0.55 $ 0.54 $ 1.35 $ 1.23
Income from discontinued operations (basic) (in dollars per share) $ 0.00 $ 0.00 $ (0.01) $ 0.00
Net income per basic share (in dollars per share) $ 0.55 $ 0.54 $ 1.34 $ 1.23
Income from continuing operations (diluted) (in dollars per share) $ 0.55 $ 0.53 $ 1.33 $ 1.21
Income from discontinued operations (diluted) (in dollars per share) $ 0.00 $ 0.00 $ (0.01) $ 0.00
Net income per diluted share (in dollars per share) $ 0.55 $ 0.53 $ 1.32 $ 1.21