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Long-Term Debt and Capital Lease Obligations - Capital Lease Obligation Table (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Long term debt    
Total long-term debt and capital lease obligations $ 400,791 $ 401,017
less current portion of long-term debt and capital lease obligations (7,105) (6,186)
Long-term debt and capital lease obligations, excluding current installments 393,686 394,831
Other loans    
Long term debt    
Long-term debt 2,022 2,023
Capital Lease Obligations.    
Long term debt    
Capital leases 3,459 3,135
Senior Notes    
Long term debt    
Long-term debt 352,372 352,224
Unamortized discount and debt issuance costs 2,600 2,800
Senior Secured Credit Facilities | Tranche A-1 advances    
Long term debt    
Long-term debt 38,629 39,263
Unamortized discount and debt issuance costs 900 1,000
Senior Secured Credit Facilities | Tranche A-3 advances    
Long term debt    
Long-term debt 4,309 4,372
Unamortized discount and debt issuance costs $ 100 $ 100