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Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Assets    
Operating $ 1,020,352 $ 997,966
Finance $ 117,805 94,141
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssets  
Total leased assets $ 1,138,157 1,092,107
Current:    
Operating 208,526 168,663
Finance $ 39,298 34,966
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesCurrent  
Non-current:    
Operating $ 1,116,795 1,057,758
Finance $ 78,881 60,001
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent  
Total lease liabilities $ 1,443,500 $ 1,321,388