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Leases - Additional balance sheet information (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
ASSETS  
Operating lease assets $ 652,115
Balance Sheet classification of operating lease assets us-gaap:OperatingLeaseRightOfUseAsset
Finance lease assets $ 29,100
Balance Sheet classification of finance lease assets us-gaap:PropertyPlantAndEquipmentNet
Total lease assets $ 681,200
Current:  
Operating lease liabilities $ 168,400
Balance Sheet classification of operating lease liabilities us-gaap:AccruedLiabilitiesCurrent
Finance lease liabilities $ 9,800
Balance Sheet classification of finance lease liabilities us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
Total current lease liabilities $ 178,200
Operating lease liabilities $ 745,287
Balance Sheet classification of operating lease liabilities us-gaap:OperatingLeaseLiabilityNoncurrent
Finance lease liabilities $ 22,000
Balance Sheet classification of finance lease liabilities us-gaap:LongTermDebtAndCapitalLeaseObligations
Total non-current lease liabilities $ 767,300
Operating leases  
Operating leases 7 years 3 months 18 days
Finance leases 3 years 3 months 18 days
Weighted average discount  
Operating leases 4.60%
Finance leases 4.70%