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Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income (Loss) Per Common Share
Net income (loss)	$ (21,884)	$ (69,598)	$ (39,177)	$ (117,212)
Net income (loss) per common share:
Basic (in dollars per share)	$ (0.47)	$ (1.78)	$ (0.91)	$ (2.99)
Diluted (in dollars per share)	$ (0.47)	$ (1.78)	$ (0.91)	$ (2.99)
Weighted average shares reconciliation
Basic weighted average shares outstanding	46,941	39,131	43,100	39,193
Diluted weighted average shares outstanding	46,941	39,131	43,100	39,193

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