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Leases - Balance Sheet Location (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Operating leases    
Operating lease right of use assets $ 13,234  
Operating lease liability, current 3,131  
Operating lease liability, noncurrent 10,103 $ 0
Total operating lease liabilities 13,234  
Finance leases    
Property, plant, and equipment 3,448  
Accumulated amortization (2,828)  
Property, plant, and equipment - net 620  
Finance lease liability, current 478  
Finance lease liability, noncurrent 142  
Total finance lease liabilities $ 620 $ 974