Long-term Debt Obligations (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Obligations
Carrying value of long-term debt	$ 241,013	$ 220,152
Current portion of long-term debt and lease obligations	(60,551)	(5,906)
Long-term debt, net of current maturities	180,462	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	50,000	35,000
Equipment capital leases [Member]
Obligations
Carrying value of long-term debt	9,091	8,651
Brazil bank debt [Member]
Obligations
Carrying value of long-term debt	5,649	0
Facility lease obligation [Member]
Obligations
Carrying value of long-term debt	$ 1,273	$ 1,501