Earnings Per Share - Summary (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Basic:
Net Loss	$ (183,718)	$ (311,253)
Less: net loss allocable to participating RSUs	0	0
Net loss available for basic common shares	$ (183,718)	$ (311,253)
Weighted average common shares outstanding	345,852	344,434
Basic net loss per common share (USD per share)	$ (0.53)	$ (0.90)
Diluted:
Net Loss	$ (183,718)	$ (311,253)
Less: net loss allocable to participating RSUs	0	0
Net loss available for diluted common shares	$ (183,718)	$ (311,253)
Weighted average common shares outstanding	345,852	344,434
Weighted average common equivalent shares arising from:
Dilutive stock options and non-participating RSUs (shares)	0	0
Weighted average number of common and potential common shares	345,852	344,434
Diluted net loss per common share (USD per share)	$ (0.53)	$ (0.90)