Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Finance lease right-of-use assets, net:
Property and equipment, gross	$ 364,910	$ 376,159
Accumulated depreciation	(71,288)	(57,955)
Property and equipment, net	$ 293,622	$ 318,204
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Operating lease right-of-use assets	$ 599,985	$ 687,555
Total lease assets	893,607	1,005,759
Finance lease liabilities:
Current portion of debt	$ 51,856	$ 33,561
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent	us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
Long-term debt	$ 161,509	$ 196,697
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtNoncurrent	us-gaap:LongTermDebtNoncurrent
Total finance lease liabilities	$ 213,365	$ 230,258
Operating lease liabilities:
Current portion of operating lease liabilities	102,677	96,976
Long-term operating lease liabilities	563,876	601,641
Total operating lease liabilities	666,553	698,617
Total lease liabilities	$ 879,918	$ 928,875