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Loss Per Common Share (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
Numerator
Net loss	$ (8,206)	$ (27,791)	$ (34,245)	$ (85,978)	$ (168,093)	$ (23,789)	$ (15,160)	$ (28,287)	$ (156,220)	$ (235,329)	$ (90,733)
Denominator
Basic and diluted weighted average common shares (in shares)									226,042	225,159	223,999
Loss per common share:
Basic and diluted (in USD per share)	$ (0.04)	$ (0.12)	$ (0.15)	$ (0.38)	$ (0.75)	$ (0.11)	$ (0.07)	$ (0.13)	$ (0.69)	$ (1.05)	$ (0.41)
Antidilutive securities excluded from computation of EPS (in USD per share)	1,048				737						922

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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