Debt (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Carrying value of debt	$ 260,384	$ 265,050
Current portion of long-term debt	(18,750)	(15,000)
Total long-term debt, net	241,634	250,050
Senior Subordinated Convertible Notes 2010
Debt Instrument [Line Items]
Carrying value of debt	132,884	130,050
2012 Credit Agreement | Revolving Loan
Debt Instrument [Line Items]
Carrying value of debt
2012 Credit Agreement | Term Loan
Debt Instrument [Line Items]
Carrying value of debt	$ 127,500	$ 135,000