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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Abstract]        
Income from continuing operations for calculating basic and diluted earnings per share $ 11,173 $ 19,528 $ 41,300 $ 58,497
Loss from discontinued operations 0 0 0 (272)
Net income $ 11,173 $ 19,528 $ 41,300 $ 58,225
Weighted-average common shares for calculating basic earnings per share (shares) 28,019 28,397 28,206 28,762
Stock options and nonvested awards (shares) 205 408 212 398
Weighted-average common shares for calculating diluted earnings per share (shares) 28,224 28,805 28,418 29,160
Basic earnings per share:        
Income from continuing operations (in dollars per share) $ 0.40 $ 0.69 $ 1.46 $ 2.03
Income from discontinued operations (in dollars per share) 0.00 0.00 0.00 (0.01)
Net income per basic share (in dollars per share) 0.40 0.69 1.46 2.02
Diluted earnings per share:        
Income from continuing operations (in dollars per share) 0.40 0.68 1.45 2.01
Income from discontinued operations (in dollars per share) 0.00 0.00 0.00 (0.01)
Net income per diluted share (in dollars per share) $ 0.40 $ 0.68 $ 1.45 $ 2.00