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Property and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross $ 92,510   $ 92,510   $ 82,352
Property, Plant and Equipment, Net 42,603   42,603   36,586
Depreciation 1,649 $ 1,690 4,956 $ 5,412  
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (49,907)   (49,907)   (45,766)
Land [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross 3,828   3,828   3,828
Building and Building Improvements [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross 24,058   24,058   21,717
Leasehold Improvements [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross 428   428   155
Machinery and Equipment [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross 46,360   46,360   41,777
Office And Computer Equipment [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross 17,785   17,785   14,824
Vehicles [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross $ 51   $ 51   $ 51