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Commitments and Contingencies - Capital Leases Future Minimum Payments (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2018 $ 15,829
2020 135
2022 75
Total minimum rental payments 16,039
Less: Amount representing interest (186)
Capital lease obligation $ 15,853