Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Facility operating expense	$ 4,935	$ 4,604	$ 9,785	$ 9,229
Facility lease expense	62,379	67,689	126,860	136,357	$ 126,860	$ 136,357
Operating lease expense	67,314	72,293	136,645	145,586
Operating lease expense adjustment	8,221	4,429	14,954	8,812
Changes in operating lease assets and liabilities for lessor capital expenditure reimbursements	(6,421)	(1,000)	(10,509)	(1,000)
Operating cash flows from operating leases	69,114	75,722	141,090	153,398
Depreciation and amortization	8,037	11,677	17,181	23,355
Interest expense: financing lease obligations	11,892	16,649	25,174	33,392
Financing lease expense	19,929	28,326	42,355	56,747
Operating cash flows from financing leases	11,892	16,649	25,174	33,392
Financing cash flows from financing leases	4,677	5,500	9,764	10,953
Changes in financing lease assets and liabilities for lessor capital expenditure reimbursement	(1,675)	0	(3,414)	0
Total cash flows from financing leases	$ 14,894	$ 22,149	$ 31,524	$ 44,345