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Net Income (Loss) Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 10, 2013
Earnings Per Share, Basic and Diluted [Abstract]
Net loss	$ (11,213)us-gaap_NetIncomeLoss	$ 5,295us-gaap_NetIncomeLoss
Weighted average shares- basic	67,263,000	63,405,000
Weighted average shares- diluted	67,263,000	66,017,000
Net income (loss) per share-basic (in dollars per share)	$ (0.17)us-gaap_EarningsPerShareBasic	$ 0.08us-gaap_EarningsPerShareBasic
Net income (loss) per share-diluted (in dollars per share)	$ (0.17)us-gaap_EarningsPerShareDiluted	$ 0.08us-gaap_EarningsPerShareDiluted
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Shares included in the Calculation of Earnings Per Share Because Their Impact was Dilutive	0	2,612,000
Securities Excluded from Calculations of Earnings Per Share Because Impact Would Have Been Anti-Dilutive [Abstract]
Outstanding securities used in calculations	2,182,000	1,153,000
Convertible notes	71,270us-gaap_ConvertibleNotesPayable		70,407us-gaap_ConvertibleNotesPayable
Potential Dilutive Effect of Securities [Abstract]
Conversion of the Notes	3,588,000	3,588,000
Convertible Debt
Securities Excluded from Calculations of Earnings Per Share Because Impact Would Have Been Anti-Dilutive [Abstract]
Convertible notes				$ 86,300
Stated interest rate			2.25%
Common stock options
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Shares included in the Calculation of Earnings Per Share Because Their Impact was Dilutive	0	2,027,000
Securities Excluded from Calculations of Earnings Per Share Because Impact Would Have Been Anti-Dilutive [Abstract]
Outstanding securities used in calculations	1,813,000	1,153,000
Restricted Stock
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Shares included in the Calculation of Earnings Per Share Because Their Impact was Dilutive	0	152,000
Securities Excluded from Calculations of Earnings Per Share Because Impact Would Have Been Anti-Dilutive [Abstract]
Outstanding securities used in calculations	135,000	0
Restricted stock units
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Shares included in the Calculation of Earnings Per Share Because Their Impact was Dilutive	0	433,000
Securities Excluded from Calculations of Earnings Per Share Because Impact Would Have Been Anti-Dilutive [Abstract]
Outstanding securities used in calculations	234,000	0