Property, Plant, and Equipment (Summary of Property, Plant, and Equipment) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Capitalized manufacturing equipment for specific use	$ 265,353	$ 254,419
Less accumulated depreciation and amortization	(116,706)	(112,258)
Total property, plant, and equipment, net	148,647	142,161
Buildings
Property, Plant and Equipment [Line Items]
Capitalized manufacturing equipment for specific use	84,246	82,309
Leasehold improvement
Property, Plant and Equipment [Line Items]
Capitalized manufacturing equipment for specific use	24,580	23,392
Land
Property, Plant and Equipment [Line Items]
Capitalized manufacturing equipment for specific use	6,915	6,895
Machinery and equipment
Property, Plant and Equipment [Line Items]
Capitalized manufacturing equipment for specific use	109,562	108,442
Furniture, fixtures, and automobiles
Property, Plant and Equipment [Line Items]
Capitalized manufacturing equipment for specific use	14,872	13,439
Construction in progress
Property, Plant and Equipment [Line Items]
Capitalized manufacturing equipment for specific use	$ 25,178	$ 19,942