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Long-Term Obligations and Commitments, Maturity Schedules (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Annual Debt and Other Obligation Maturities [Abstract]    
Less: current portion $ (1,621) $ (1,185)
Total 605,856 $ 587,920
Long-Term Obligations, Excluding Financing Liability for Leased Facility [Member]    
Annual Debt and Other Obligation Maturities [Abstract]    
2018 9,617  
2019 22,082  
2020 9,330  
2021 694,774  
2022 2,809  
Thereafter 71,603  
Total minimum payments 810,215  
Less: current portion (53)  
Less: fixed and determinable interest (51,465)  
Less: unamortized portion of debt discount (144,791)  
Plus: Deferred rent 165  
Total $ 614,071