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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

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