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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, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income (Loss) Per Common Share
Net income (loss)	$ 5,306	$ (13,977)	$ (22,191)	$ (10,028)
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.13	$ (0.35)	$ (0.56)	$ (0.26)
Diluted (in dollars per share)	$ 0.13	$ (0.35)	$ (0.56)	$ (0.26)
Basic weighted average shares outstanding	40,846	39,401	39,729	39,317
Effect of potentially dilutive share-based awards	133
Diluted weighted average shares outstanding	40,979	39,401	39,729	39,317

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