Commitments and Contingencies - Finance Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finance lease costs
Right of use assets obtained in exchange for new finance lease liabilities	$ 5,900	$ 2,200
Restricted Cash
Restricted cash	125,100
Letter of credit	103,400
Sale Leaseback Agreements
Total Payments of future minimum lease payments
Total lease liabilities	31,700	81,900
Finance lease costs
Amortization of right of use asset	3,178	7,549
Interest on finance obligations	4,863	6,908
Total finance lease cost	8,041	14,457
Other information
Cash payments	$ 61,237	$ 33,715
Weighted average remaining lease term (years)	2 years 11 months 27 days	3 years 2 months 1 day
Weighted average discount rate	11.10%	11.80%
Finance Lease [Member]
Total Payments of future minimum lease payments
2020	$ 10,128
2021	9,276
2022	4,975
2023	3,150
2024 and thereafter	16,154
Total future minimum lease payments	43,683
Less imputed lease interest	(11,934)
Sale of future services	109,422
Total lease liabilities	141,171
Other Leased Property [Member]
Total Payments of future minimum lease payments
2020	414
2021	407
2022	390
2023	366
2024 and thereafter	1,547
Total future minimum lease payments	3,124
Less imputed lease interest	(887)
Total lease liabilities	2,237
Total Finance Lease [Member]
Total Payments of future minimum lease payments
2020	55,391
2021	54,602
2022	45,694
2023	39,254
2024 and thereafter	88,419
Total future minimum lease payments	283,360
Less imputed lease interest	(78,047)
Sale of future services	109,422
Total lease liabilities	314,735
Finance obligation
Restricted Cash
Letter of credit	500
Finance obligation | Property and equipment
Total Payments of future minimum lease payments
Total future minimum lease payments	$ 2,200