Net Loss 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, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net income (loss)	$ 30,874	$ (865)	$ (8,605)	$ (13,018)	$ 30,009	$ (21,623)
Add: interest from 2023 Notes (tax effected)	3,237		0		6,427	0
Net income (loss) - diluted	$ 34,111		$ (8,605)		$ 36,436	$ (21,623)
Weighted average shares:
Basic shares (in shares)	54,272		37,356		47,665	37,355
Effect of dilutive securities—options and warrants outstanding (in shares)	15,670		0		15,418	0
Diluted shares (in shares)	69,942		37,356		63,083	37,355
Net income (loss) per share - basic (in dollars per share)	$ 0.57		$ (0.23)		$ 0.63	$ (0.58)
Net income (loss) per share - diluted (in dollars per share)	$ 0.49		$ (0.23)		$ 0.58	$ (0.58)