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Earnings Per Share - Summary (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Basic:
Net Loss	$ (240,931)	$ (56,075)	$ (552,184)	$ (169,306)
Less: net loss allocable to participating RSUs	0	0	0	0
Net loss available for basic common shares	$ (240,931)	$ (56,075)	$ (552,184)	$ (169,306)
Weighted average common shares outstanding	344,584	343,116	344,507	343,020
Basic net loss per common share (USD per share)	$ (0.70)	$ (0.16)	$ (1.60)	$ (0.49)
Diluted:
Net Loss	$ (240,931)	$ (56,075)	$ (552,184)	$ (169,306)
Less: net loss allocable to participating RSUs	0	0	0	0
Net loss available for diluted common shares	$ (240,931)	$ (56,075)	$ (552,184)	$ (169,306)
Weighted average common shares outstanding	344,584	343,116	344,507	343,020
Weighted average common equivalent shares arising from:
Dilutive stock options and non-participating RSUs (shares)	0	0	0	0
Weighted average number of common and potential common shares	344,584	343,116	344,507	343,020
Diluted net loss per common share (USD per share)	$ (0.70)	$ (0.16)	$ (1.60)	$ (0.49)

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