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Summary of Supplemental Balance Sheet Information Related to Leases (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Operating leases    
Operating lease right-of-use assets, gross $ 175,898  
Accumulated amortization 17,813  
Operating lease right-of-use assets, net 158,085  
Current portion of operating leases 29,351  
Non-current operating leases 143,426  
Total operating lease liabilities 172,777  
Finance leases    
Property and equipment, gross 13,290  
Accumulated depreciation (2,785)  
Property and equipment, net 10,505  
Current portion of finance leases, net 1,763  
Noncurrent finance leases, net 5,323  
Total finance lease liabilities $ 7,086 $ 7,127