E. Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, plant and equipment, gross	$ 125,331	$ 84,748
Less accumulated depreciation and amortization	(37,970)	(32,412)
Property, plant and equipment	87,361	52,336
Construction in progress	21,237	11,371
Land	1,101	1,101
Property, plant and equipment, net	109,699	64,808
Land Improvements [Member]
Property, plant and equipment, gross	863	103
Building and improvements [Member]
Property, plant and equipment, gross	27,255	16,196
Machinery and equipment [Member]
Property, plant and equipment, gross	88,882	61,529
Furniture and fixtures [Member]
Property, plant and equipment, gross	2,422	1,938
Computer equipment and software [Member]
Property, plant and equipment, gross	5,615	4,712
Transportation equipment [Member]
Property, plant and equipment, gross	$ 294	$ 270

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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