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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Earnings Per Share [Abstract]        
Net income $ 11,673 $ 13,339 $ 24,847 $ 30,127
Weighted-average common shares for calculating basic earnings per share (shares) 28,243 28,196 28,242 28,299
Stock options and nonvested awards (shares) 0 215 0 216
Weighted-average common shares for calculating diluted earnings per share (shares) 28,243 28,411 28,242 28,515
Net income per share:        
Net income per basic share (in dollars per share) $ 0.41 $ 0.47 $ 0.88 $ 1.06
Net income per diluted share (in dollars per share) $ 0.41 $ 0.47 $ 0.88 $ 1.06