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Earnings (Loss) Per Share - Computation of Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net income (loss)	$ 5,966	$ 5,278	$ (24,644)	$ (787,434)	$ 11,244	$ (812,078)
Basic weighted-average common shares outstanding	68,869		67,256		68,328	67,095
Effect of dilutive stock-based compensation awards	1,825		0		2,462	0
Diluted weighted-average common shares outstanding	70,694		67,256		70,790	67,095
Earnings (loss) per share, basic	$ 0.09		$ (0.37)		$ 0.16	$ (12.10)
Earnings (loss) per share, diluted	$ 0.08		$ (0.37)		$ 0.16	$ (12.10)

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