Leases - Other Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance leases	$ 57,084	$ 54,417
Operating cash flows from operating leases	152,052	102,146
Financing cash flows from finance leases	98,877	42,681
Right-of-use assets obtained in exchange for lease obligations
Finance leases	339,486	311,951
Operating leases	$ 50	$ 14,114
Weighted-average remaining lease term - finance leases	14 years		14 years
Weighted-average remaining lease term - operating leases	12 years		12 years
Weighted-average discount rate - finance leases	7.00%		7.00%
Weighted-average discount rate - operating leases	4.00%		4.00%
Finance lease right-of-use assets	$ 1,912,014		$ 1,688,032
Accumulated amortization, finance lease, right-of-use asset	$ 651,500		$ 604,100