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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income (Loss) Per Share
Net income (loss)	$ (32,871)	$ (11,767)	$ (15,565)	$ (18,530)	$ (144,674)	$ (8,953)	$ (237,634)	$ (15,827)	$ (78,733)	$ (407,088)	$ (51,396)
Net income (loss) per common share:
Basic (in dollars per share)	$ (0.69)	$ (0.25)	$ (0.33)	$ (0.40)	$ (3.11)	$ (0.19)	$ (5.02)	$ (0.34)	$ (1.66)	$ (8.63)	$ (1.16)
Diluted (in dollars per share)	$ (0.69)	$ (0.25)	$ (0.33)	$ (0.40)	$ (3.11)	$ (0.19)	$ (5.02)	$ (0.34)	$ (1.66)	$ (8.63)	$ (1.16)
Weighted average shares reconciliation
Basic weighted average shares outstanding									47,482	47,151	44,174
Diluted weighted average shares outstanding									47,482	47,151	44,174

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