Net (Loss) Income Per Share - Reconciliation of Basic and Diluted Calculation (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 (loss) income	$ (19,581)	$ (13,445)	$ 30,874	$ (865)	$ (33,026)	$ 30,009
Add: interest from 2023 Notes, net of tax	0		3,237		0	6,427
Net (loss) income - diluted	$ (19,581)		$ 34,111		$ (33,026)	$ 36,436
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Basic shares (in shares)	58,488		54,272		58,465	47,665
Effect of dilutive securities—employee and director equity awards outstanding, preferred shares and 2023 Notes (in shares)	0		15,670		0	15,418
Diluted shares (in shares)	58,488		69,942		58,465	63,083
Net loss per share - basic (in dollars per share)	$ (0.33)		$ 0.57		$ (0.56)	$ 0.63
Net loss per share - diluted (in dollars per share)	$ (0.33)		$ 0.49		$ (0.56)	$ 0.58