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Plant, Equipment and Leasehold Improvements (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Plant, Equipment and Leasehold Improvements      
Plant, equipment and leasehold improvements, gross $ 91,512   $ 87,966
Less accumulated depreciation and amortization (38,042)   (34,547)
Plant, equipment and leasehold improvements, net 53,470   53,419
Depreciation 3,310 $ 2,973  
Buildings      
Plant, Equipment and Leasehold Improvements      
Plant, equipment and leasehold improvements, gross 2,108   2,077
Machinery and equipment      
Plant, Equipment and Leasehold Improvements      
Plant, equipment and leasehold improvements, gross 60,193   59,464
Furniture, fixtures and computer equipment      
Plant, Equipment and Leasehold Improvements      
Plant, equipment and leasehold improvements, gross 6,843   6,634
Leasehold improvements      
Plant, Equipment and Leasehold Improvements      
Plant, equipment and leasehold improvements, gross 18,715   18,655
Construction in progress      
Plant, Equipment and Leasehold Improvements      
Plant, equipment and leasehold improvements, gross $ 3,653   $ 1,136