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Income (Loss) Per Share - Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income (Loss) Per Share
Net income (loss)									$ (8,391)	$ (78,733)	$ (407,088)
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.00	$ 0.01	$ (0.17)	$ (0.01)	$ (0.69)	$ (0.25)	$ (0.33)	$ (0.40)	$ (0.17)	$ (1.66)	$ (8.63)
Diluted (in dollars per share)	$ 0.00	$ 0.01	$ (0.17)	$ (0.01)	$ (0.69)	$ (0.25)	$ (0.33)	$ (0.40)	$ (0.17)	$ (1.66)	$ (8.63)
Weighted average shares reconciliation
Basic weighted average shares outstanding									48,362	47,482	47,151
Diluted weighted average shares outstanding									48,362	47,482	47,151

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