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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share [Abstract]        
Net income (loss) $ (1,412) $ 11,173 $ 23,435 $ 41,300
Weighted-average common shares for calculating basic earnings per share (shares) 34,631 28,019 30,372 28,206
Stock options and nonvested awards (shares) 0 205 0 212
Weighted-average common shares for calculating diluted earnings per share (shares) 34,631 28,224 30,372 28,418
Net income (loss) per share:        
Net income per basic share (in dollars per share) $ (0.04) $ 0.40 $ 0.77 $ 1.46
Net income per diluted share (in dollars per share) $ (0.04) $ 0.40 $ 0.77 $ 1.45