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Leases (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
Operating right-of-use assets $ 34,329 $ 0
Property, plant and equipment, net 554  
Total right-of use assets 34,883  
Operating lease liabilities, current and long-term portions 34,893  
Long-term debt, current and long-term portions 615  
Total lease liabilities $ 35,508