Commitments and Contingencies - Capital Leases (Details) - USD ($) $ in Thousands	1 Months Ended
	Jul. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Restricted Cash
Restricted cash		$ 51,000
Letter of credit		1,000
Capital Leases
Total Payments of future minimum lease payments
Remainder of 2017		13,025
2018		11,818
2019		3,600
2020		3,600
2021		3,600
2022 and Thereafter		1,908
Total future minimum lease payments		37,551
Imputed Interest of future minimum lease payments
Remainder of 2017		2,019
2018		2,163
2019		1,499
2020		1,135
2021		711
2022 and Thereafter		175
Total future minimum lease payments: Imputed Interest		7,702
Net Present Value of future minimum lease payments
Remainder of 2017		11,006
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		29,849
Cash received for future services		11,700	$ 12,800
Subsequent event
Net Present Value of future minimum lease payments
Proceeds from sale/leaseback	$ 13,600
Long-term debt. | Capital Leases
Sale Leaseback Transaction [Line Items]
Sale-leaseback liability		29,800
Finance obligation
Sale Leaseback Transaction [Line Items]
Sale-leaseback liability		$ 2,300	$ 2,400