Fair Value Measurement (Details 4) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair Value Measurement
Long-term debt	$ (267,171)	$ (253,400)
Senior Credit Facility, net of discount
Fair Value Measurement
Long-term debt	(264,927)	(251,010)
Other obligations
Fair Value Measurement
Long-term debt	(2,244)	(2,390)
Carrying Amount
Fair Value Measurement
Cash and cash equivalents	18,794	18,196
Carrying Amount | Senior Credit Facility, net of discount
Fair Value Measurement
Long-term debt	(267,171)	(253,400)
Total Fair Value
Fair Value Measurement
Cash and cash equivalents	18,794	18,196
Total Fair Value | Senior Credit Facility, net of discount
Fair Value Measurement
Long-term debt	$ (267,171)	$ (253,400)