Long-term Debt Obligations (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Obligations
Carrying value of long-term debt	$ 185,484	$ 220,152
Current portion of long-term debt and lease obligations	(5,901)	(5,906)
Non-current portion of long-term debt and lease obligations	179,583	214,246
Senior secured second-priority notes [Member]
Obligations
Carrying value of long-term debt	175,000	175,000
Revolving line of credit [Member]
Obligations
Carrying value of long-term debt	0	35,000
Equipment capital leases [Member]
Obligations
Carrying value of long-term debt	9,693	8,651
Facility lease obligation [Member]
Obligations
Carrying value of long-term debt	$ 791	$ 1,501