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Summary of Significant Accounting Policies - Supplemental Balance Sheet (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Accounting Policies [Abstract]    
Operating lease right-of-use assets $ 1,963,019 $ 1,869,101
Financing lease right-of-use assets, net of accumulated depreciation(1) 306,640 327,215
Current    
Operating lease liabilities 236,019 223,249
Finance lease liabilities 42,620 46,582
Long-term    
Operating lease liabilities 1,818,844 1,728,686
Finance lease liabilities $ 311,387 $ 320,600
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccruedLiabilitiesCurrent us-gaap:AccruedLiabilitiesCurrent
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligations us-gaap:LongTermDebtAndCapitalLeaseObligations