Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Sep. 10, 2019
Leases
Operating lease cost (1)	$ 18,118	$ 83,914	$ 35,849	$ 164,984
Short-term lease cost (2)	2,891	3,742	5,558	6,226
Amortization of right-of-use assets	17,755	3,805	35,659	9,913
Interest on lease liabilities	5,443	1,099	11,256	2,280
Total finance lease cost	23,198	4,904	46,915	12,193
Total lease costs	44,207	92,560	88,322	183,403
Operating lease assets	$ 113,852		$ 113,852		$ 144,330	$ 495,000
Lease expense		$ 67,000		$ 134,000