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Property and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross $ 90,268   $ 90,268   $ 82,352
Property, Plant and Equipment, Net 41,754   41,754   36,586
Depreciation 1,614 $ 1,815 3,307 $ 3,722  
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (48,514)   (48,514)   (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 23,848   23,848   21,717
Leasehold Improvements [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross 354   354   155
Machinery and Equipment [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross 45,359   45,359   41,777
Office And Computer Equipment [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross 16,828   16,828   14,824
Vehicles [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross $ 51   $ 51   $ 51