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(Loss) Earnings Per Share - Computation of Basic and Diluted (Loss) Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
May 31, 2017
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]                        
Net (loss) income   $ (4,110) $ (426,157) $ (6,026) $ (9,031) $ 9,357 $ 15,797 $ 12,726 $ 929 $ (445,324) $ 38,809 $ 224,443
Basic weighted-average common shares outstanding 71,600                 66,995 70,318 71,661
Effect of dilutive stock-based compensation awards                   0 229 66
Diluted weighted-average common shares outstanding                   66,995 70,547 71,727
(Loss) earnings per share, basic   $ (0.06) $ (6.38) $ (0.09) $ (0.13) $ 0.14 $ 0.23 $ 0.18 $ 0.01 $ (6.65) $ 0.55 $ 3.13
(Loss) earnings per share, diluted   $ (0.06) $ (6.38) $ (0.09) $ (0.13) $ 0.14 $ 0.23 $ 0.18 $ 0.01 $ (6.65) $ 0.55 $ 3.13