Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 84,276		$ 82,352
Property, Plant and Equipment, Net	37,159		36,586
Depreciation	1,693	$ 1,907
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(47,117)		(45,766)
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	3,828		3,828
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	22,994		21,717
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	155		155
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	42,258		41,777
Office And Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	14,990		14,824
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 51		$ 51