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Summary of Supplemental Balance Sheet Information Related to Leases (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Operating leases    
Operating lease right-of-use assets, gross $ 172,394  
Accumulated amortization (9,350)  
Operating lease right-of-use assets, net 163,044  
Current portion of operating leases 36,050  
Non-current operating leases 142,444  
Total operating lease liabilities 178,494  
Finance leases    
Property and equipment, gross 7,966  
Accumulated depreciation (2,117)  
Property and equipment, net 5,849  
Current portion of finance leases, net 1,798  
Noncurrent finance leases, net 5,750  
Total finance lease liabilities $ 7,548 $ 7,127