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Summary of Significant Accounting Policies - Supplemental Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]      
Operating lease right-of-use assets $ 2,196,502 $ 1,869,101 $ 0
Financing lease right-of-use assets, net of accumulated depreciation 310,534 327,215  
Current      
Operating lease liabilities 250,239 223,249  
Financing lease liabilities 43,149 46,582  
Long-term      
Operating lease liabilities 2,044,598 1,728,686 $ 0
Financing lease liabilities $ 323,162 $ 320,600  
Operating lease, right-of-use asset, real estate assets, percent 99.00%    
Operating lease, right-of-use asset, non-real estate assets, percent 1.00%    
Finance lease, right-of-use asset, real estate assets, percent 72.00% 69.00%  
Finance lease, right-of-use asset, non-real estate assets, percent 28.00% 31.00%  
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:AccountsPayableAndAccruedLiabilitiesCurrent us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent  
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