Commitments and Contingencies - Capital Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Restricted Cash
Restricted cash	$ 52,900
Letter of credit	1,000
Capital Leases
Total Payments of future minimum lease payments
Remainder of 2017	16,631
2018	11,817
2019	3,600
2020	3,600
2021	3,600
2022 and Thereafter	1,908
Total future minimum lease payments	41,156
Imputed Interest of future minimum lease payments
Remainder of 2017	3,236
2018	2,162
2019	1,499
2020	1,135
2021	711
2022 and Thereafter	175
Total future minimum lease payments: Imputed Interest	8,918
Net Present Value of future minimum lease payments
Remainder of 2017	13,395
2018	9,655
2019	2,101
2020	2,465
2021	2,889
2022 and Thereafter	1,733
Total future minimum lease payments: Net Present Value	32,238
Cash received for future services	12,300	$ 12,800
Long-term debt. | Capital Leases
Sale Leaseback Transaction [Line Items]
Sale-leaseback liability	32,200
Finance obligation
Sale Leaseback Transaction [Line Items]
Sale-leaseback liability	$ 2,300	$ 2,400