Debt (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Carrying value of debt	$ 262,703	$ 265,050
Current portion of long-term debt	(16,875)	(15,000)
Non-current portion of long-term net, net of OID	245,828	250,050
Senior Subordinated Convertible Notes 2010
Debt Instrument [Line Items]
Carrying value of debt	131,453	130,050
2012 Credit Agreement | Term Loan
Debt Instrument [Line Items]
Carrying value of debt	131,250	135,000
2012 Credit Agreement | Revolving Loan
Debt Instrument [Line Items]
Carrying value of debt