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Commitments and Contingencies - Capital Lease Financing Obligations (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Capital Leases, Future Minimum Payments Due [Abstract]  
2018 $ 24,004
2019 10,252
2020 5,434
2021 3,676
2022 1,706
Thereafter 387
Total payments 45,459
Less: amount representing interest (2,432)
Present value of payments $ 43,027
Minimum  
Capital Leased Assets  
Effective interest rate (less than for minimum) 1.00%
Maximum  
Capital Leased Assets  
Effective interest rate (less than for minimum) 9.00%