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Summary of Supplemental Balance Sheet Information Related to Leases (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Operating leases    
Operating lease right-of-use assets, gross $ 175,898  
Accumulated amortization 26,987  
Operating lease right-of-use assets, net 148,911  
Current portion of operating leases 25,822  
Non-current operating leases 138,104  
Total operating lease liabilities 163,926  
Finance leases    
Property and equipment, gross 18,209  
Accumulated depreciation (3,356)  
Property and equipment, net 14,853  
Current portion of finance leases, net 3,201  
Noncurrent finance leases, net 8,368  
Total finance lease liabilities $ 11,569 $ 7,127