Net Income (Loss) Per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Basic and diluted net loss per common share calculation:
Net income (loss)	$ 7,610us-gaap_NetIncomeLoss	$ (20,682)us-gaap_NetIncomeLoss
Weighted average common shares outstanding - basic	34,154	32,282
Plus: effect of dilutive stock options, warrants and unvested restricted stock units	1,085
Weighted average common shares outstanding - dilutive	35,239	32,282
Net income (loss) per share of common stock - basic	$ 0.22us-gaap_EarningsPerShareBasic	$ (0.64)us-gaap_EarningsPerShareBasic
Net income (loss) per share of common stock - diluted	$ 0.22us-gaap_EarningsPerShareDiluted	$ (0.64)us-gaap_EarningsPerShareDiluted
Anti-dilutive securities
Total (in shares)	929	3,814
Stock options
Anti-dilutive securities
Total (in shares)	929	3,726
Warrants
Anti-dilutive securities
Total (in shares)		88

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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