Earnings (Loss) Per Share - Reconciliation of basic and diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net income (loss):
Net income (loss) from continuing operations	$ (41,276,000)	$ 41,798,000	$ (89,487,000)
Net income (loss) from discontinued operations	0	0	4,018,000
Net income (loss)	$ (41,276,000)	$ 41,798,000	$ (85,469,000)
Weighted average shares:
Basic shares (in shares)	41,248	40,580	36,214
Effect of dilutive securities - options and warrants outstanding (in shares)	0	3,039	0
Diluted shares (in shares)	41,248	43,619	36,214
Earnings (loss) per share - basic:
Continuing operations (in usd per share)	$ (1.00)	$ 1.03	$ (2.47)
Discontinued operations (in usd per share)	0.00	0.00	0.11
Net income (loss) per share - basic (in usd per share)	(1.00)	1.03	(2.36)
Earnings (loss) per share - diluted:
Continuing operations (in usd per share)	(1.00)	0.96	(2.47)
Discontinued operations (in usd per share)	0.00	0.00	0.11
Net income (loss) per share - diluted (in usd per share)	$ (1.00)	$ 0.96	$ (2.36)