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Summary of Significant Accounting Policies - Supplemental Balance Sheet (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Accounting Policies [Abstract] |  |
Operating lease right-of-use assets | $ 2,205,299 | $ 2,196,502
Financing lease right-of-use assets, net of accumulated depreciation | 300,399 | 310,534
Current |  |
Operating lease liabilities | 248,319 | 250,239
Finance lease liabilities | 42,692 | 43,149
Long-term |  |
Operating lease liabilities | 2,061,140 | 2,044,598
Finance lease liabilities | $ 311,448 | $ 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

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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