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Leases - Summary of Lease Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Operating leases | $ 398,594 | $ 452,919
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | us-gaap:PropertyPlantAndEquipmentNet | us-gaap:PropertyPlantAndEquipmentNet
Finance leases | $ 73,201 | $ 23,061
Current liabilities |  |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | us-gaap:OtherAccruedLiabilitiesCurrent | us-gaap:OtherAccruedLiabilitiesCurrent
Operating leases | $ 13,627 | $ 18,893
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] | us-gaap:OtherAccruedLiabilitiesCurrent | us-gaap:OtherAccruedLiabilitiesCurrent
Finance leases | $ 13,879 | $ 164
Non-current liabilities |  |
Operating leases | $ 123,124 | $ 159,182
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | us-gaap:OtherLiabilitiesNoncurrent | us-gaap:OtherLiabilitiesNoncurrent
Finance leases | $ 54,379 | $ 17,759

X
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- Definition Amount of lessee's right to use underlying asset under finance lease. + 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 (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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