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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

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