Equity Method Investments - Operating Results (Details) - ICP [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Schedule of Equity Method Investments [Line Items]
Net sales	$ 49,609	$ 39,598
Cost of sales and expenses	47,886	35,169
Net income	$ 1,723	$ 4,429