Consolidated Income Statements - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
NET SALES	$ 727,946	$ 745,447	$ 789,564
Cost of sales	650,717	686,796	725,503
Restructuring costs (Note 2)	6,012	8,429	0
Cost of Goods Sold, Including Restructuring Costs	656,729	695,225	725,503
GROSS PROFIT	71,217	50,222	64,061
Selling, general and administrative expenses	34,923	32,309	29,468
INCOME FROM OPERATIONS	36,294	17,913	34,593
Interest income, net	103	1,095	1,691
Other income (expense), net	(1,114)	(3,306)	557
INCOME BEFORE INCOME TAXES	35,283	15,702	36,841
Income tax provision	11,339	6,899	14,017
NET INCOME	$ 23,944	$ 8,803	$ 22,824
EARNINGS PER SHARE - BASIC	$ 0.90	$ 0.33	$ 0.83
EARNINGS PER SHARE - DILUTED	$ 0.90	$ 0.33	$ 0.83