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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share [Abstract]        
Net income (loss) $ 28,274 $ (1,412) $ 76,158 $ 23,435
Denominator (in thousands):        
Weighted-average common shares for calculating basic earnings per share (shares) 47,628 34,631 48,090 30,372
Stock options and nonvested stock awards (shares) 40 0 27 0
Weighted-average common shares for calculating diluted earnings per share (shares) 47,668 34,631 48,117 30,372
Net income (loss) per share:        
Basic (in dollars per share) $ 0.59 $ (0.04) $ 1.58 $ 0.77
Diluted (in dollars per share) $ 0.59 $ (0.04) $ 1.58 $ 0.77