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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share [Abstract]    
Net income $ 13,174 $ 16,788
Weighted-average common shares for calculating basic earnings per share (shares) 28,241 28,402
Stock options and nonvested awards (shares) 0 218
Weighted-average common shares for calculating diluted earnings per share (shares) 28,241 28,620
Net income per share:    
Net income per basic share (in dollars per share) $ 0.47 $ 0.59
Net income per diluted share (in dollars per share) $ 0.47 $ 0.59