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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, 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
Numerator
Net loss	$ (168,093)	$ (23,789)	$ (15,160)	$ (28,287)	$ (15,898)	$ (6,999)	$ (25,763)	$ (42,073)	$ (235,329)	$ (90,733)	$ (159,457)
Denominator
Basic and diluted weighted average common shares (in shares)									225,159	223,999	222,940
Loss per common share:
Basic and diluted (in USD per share)	$ (0.75)	$ (0.11)	$ (0.07)	$ (0.13)	$ (0.07)	$ (0.03)	$ (0.12)	$ (0.19)	$ (1.05)	$ (0.41)	$ (0.72)
Antidilutive securities excluded from computation of EPS (in USD per share)									737	922	648

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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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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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