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Income (Loss) Per Common Share (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
Income (Loss) Per Common Share
Net income (loss)	$ (237,634)	$ (20,817)	$ (253,461)	$ (19,177)
Net income (loss) per common share:
Basic (in dollars per share)	$ (5.02)	$ (0.49)	$ (5.35)	$ (0.47)
Diluted (in dollars per share)	$ (5.02)	$ (0.49)	$ (5.35)	$ (0.47)
Weighted average shares reconciliation
Basic weighted average shares outstanding	47,311	42,656	47,332	41,160
Diluted weighted average shares outstanding	47,311	42,656	47,332	41,160

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