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Summary of Significant Accounting Policies - Supplemental Balance Sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Accounting Policies [Abstract]    
Operating lease right-of-use assets $ 2,342,197 $ 2,196,502
Financing lease right-of-use assets, net of accumulated depreciation 297,052 310,534
Current    
Operating lease liabilities 263,784 250,239
Finance lease liabilities 43,728 43,149
Long-term    
Operating lease liabilities 2,186,625 2,044,598
Finance lease liabilities $ 308,895 $ 323,162
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] Accrued expenses and other current liabilities (includes current portion of operating lease liabilities) Accrued expenses and other current liabilities (includes current portion of operating lease liabilities)
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Current portion of long-term debt Current portion of long-term debt
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Long-term Debt, net of current portion Long-term Debt, net of current portion