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Net (Loss) Income Per Share - Reconciliation of Basic and Diluted Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net (loss) income	$ (22,002)	$ (19,581)	$ (13,445)	$ (11,703)	$ 30,874	$ (865)	$ (55,028)	$ 18,306
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Basic shares (in shares)	58,585			58,213			58,506	51,206
Effect of dilutive securities—employee and director equity awards outstanding, preferred shares and 2023 Notes (in shares)	0			0			0	1,643
Diluted shares (in shares)	58,585			58,213			58,506	52,849
Net loss per share - basic (in dollars per share)	$ (0.38)			$ (0.20)			$ (0.94)	$ 0.36
Net loss per share - diluted (in dollars per share)	$ (0.38)			$ (0.20)			$ (0.94)	$ 0.35

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