Debt (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Long-term debt
Long-term debt	$ 272,247	$ 274,698
Current portion of long-term debt	(15,000)	(15,000)
Total long-term debt, net	257,247	259,698
Senior Subordinated Convertible Notes 2010
Long-term debt
Long-term debt	125,997	124,698
2012 Credit Agreement | Term Loan
Long-term debt
Long-term debt	146,250	150,000
2012 Credit Agreement | Revolving Credit Facility
Long-term debt
Long-term debt