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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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income (Loss) Per Common Share
Net income (loss)	$ (18,388)	$ (32,082)	$ (17,293)	$ (47,615)
Net income (loss) per common share:
Basic (in dollars per share)	$ (0.43)	$ (0.82)	$ (0.42)	$ (1.22)
Diluted (in dollars per share)	$ (0.43)	$ (0.82)	$ (0.42)	$ (1.22)
Weighted average shares reconciliation
Basic weighted average shares outstanding	42,656	38,965	41,160	39,035
Diluted weighted average shares outstanding	42,656	38,965	41,160	39,035

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