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Leases - Additional balance sheet information (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Assets:  
Operating lease assets $ 647,369
Balance Sheet classification of operating lease assets us-gapp:OperatingLeaseRightOfUseAsset
Finance lease assets $ 50,600
Balance Sheet classification of finance lease assets us-gaap:PropertyPlantAndEquipmentNet
Total lease assets $ 698,000
Current:  
Operating lease liabilities $ 173,200
Balance Sheet classification of operating lease liabilities us-gaap:AccruedLiabilitiesCurrent
Finance lease liabilities $ 18,400
Balance Sheet classification of finance lease liabilities us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
Total current lease liabilities $ 191,600
Non-current  
Operating lease liabilities $ 745,030
Balance Sheet classification of operating lease liabilities us-gaap:OperatingLeaseLiabilityNoncurrent
Finance lease liabilities $ 40,700
Balance Sheet classification of finance lease liabilities us-gaap:LongTermDebtAndCapitalLeaseObligations
Total non-current lease liabilities $ 785,700
Weighted average remaining lease term (in years):  
Operating leases 7 years 3 months 18 days
Finance leases 3 years 2 months 12 days
Weighted average discount rates:  
Operating leases 4.60%
Finance leases 4.20%