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Plant, Equipment and Leasehold Improvements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Plant, Equipment and Leasehold Improvements    
Plant, equipment and leasehold improvements, gross $ 92,856 $ 85,996
Less accumulated depreciation and amortization (53,746) (41,560)
Plant, equipment and leasehold improvements, net 39,110 44,436
Depreciation 13,749 12,235
Impairments of the Company's plant, equipment, and leasehold improvement assets 0 0
Machinery and equipment    
Plant, Equipment and Leasehold Improvements    
Plant, equipment and leasehold improvements, gross 62,067 58,595
Machinery and equipment under capital leases    
Plant, Equipment and Leasehold Improvements    
Plant, equipment and leasehold improvements, gross 1,812  
Furniture, fixtures and computer equipment    
Plant, Equipment and Leasehold Improvements    
Plant, equipment and leasehold improvements, gross 7,730 6,288
Leasehold improvements    
Plant, Equipment and Leasehold Improvements    
Plant, equipment and leasehold improvements, gross 19,651 19,601
Construction in progress    
Plant, Equipment and Leasehold Improvements    
Plant, equipment and leasehold improvements, gross $ 1,596 $ 1,512