Debt (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Carrying value of debt	$ 265,050	$ 274,698
Current portion of long-term debt	(15,000)	(15,000)
Long-term debt, net of unamortized original issue discount of $19,950 and $25,302	250,050	259,698
Senior subordinated Convertible Notes 2010
Debt Instrument [Line Items]
Carrying value of debt	130,050	124,698
2012 Credit Agreement | Term Loan
Debt Instrument [Line Items]
Carrying value of debt	135,000	150,000
2012 Credit Agreement | Revolving Loan
Debt Instrument [Line Items]
Carrying value of debt