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Leases - Schedule of operating lease-related right-of-use assets and related liabilities recorded on the Company's balance sheet and the weighted average remaining lease term and discount rate (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Assets:    
Operating lease right-of-use assets $ 90,983 $ 0
Liabilities:    
Current portion of operating lease liabilities 24,726 0
Long-term portion of operating lease liabilities $ 71,162 $ 0
Other Information:    
Weighted-average remaining lease term 4 years 10 months 24 days  
Weighted average discount rate 5.10%