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Earnings Per Share - Summary (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						6 Months Ended		9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Basic
Net Income (Loss)	$ 70,596	$ (107,987)	$ (176,296)	$ 6,278	$ (237,963)	$ (311,253)	$ (284,283)	$ (549,216)	$ (213,687)	$ (542,938)
Less: Net income (loss) allocable to participating RSUs	0			0					0	0
Net income (loss) available for basic common shares	$ 70,596			$ 6,278					$ (213,687)	$ (542,938)
Weighted average number of common shares (in shares)	346,698			345,285					346,210	344,774
Basic net income (loss) per common share (USD per share)	$ 0.20		$ (0.51)	$ 0.02	$ (0.69)		$ (0.82)	$ (1.59)	$ (0.62)	$ (1.57)
Diluted
Net Income (Loss)	$ 70,596	$ (107,987)	$ (176,296)	$ 6,278	$ (237,963)	$ (311,253)	$ (284,283)	$ (549,216)	$ (213,687)	$ (542,938)
Less: Net income (loss) allocable to participating RSUs	0			0					0	0
Net income (loss) available for diluted common shares	$ 70,596			$ 6,278					$ (213,687)	$ (542,938)
Weighted average number of common shares (in shares)	346,698			345,285					346,210	344,774
Weighted average number of common equivalent shares from:
Dilutive stock options and non-participating RSUs (in shares)	1,789			387					0	0
Weighted average number of common and potential common shares (in shares)	348,487			345,672					346,210	344,774
Diluted net income (loss) per common share (USD per share)	$ 0.20		$ (0.51)	$ 0.02	$ (0.69)		$ (0.82)	$ (1.59)	$ (0.62)	$ (1.57)
Nonqualified stock options and non-participating RSUs excluded from the calculation of diluted net income per common share (in shares)	25,300			22,600

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