Leases - Other Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance leases	$ 109,558	$ 107,000
Operating cash flows from operating leases	206,512	210,848
Financing cash flows from finance leases	115,288	126,486
Right-of-use assets obtained in exchange for lease obligations:
Finance leases	487,592	387,808
Operating leases	$ 108,797	$ 145,025
Weighted-average remaining lease term - finance leases	14 years	15 years
Weighted-average remaining lease term - operating leases	12 years	13 years
Weighted-average discount rate - finance leases	7.00%	9.00%
Weighted-average discount rate - operating leases	4.00%	4.00%
Finance lease assets	$ 1,688,032	$ 1,277,614
Finance lease, right-of-use asset, accumulated amortization	$ 604,100	$ 474,800