Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Sales	$ 231,959	$ 232,615
Cost of sales	165,066	169,510
Gross profit	66,893	63,105
Selling, general, and administrative expenses	44,568	43,962
Facility closure and restructuring charges	1,537	0
Operating income	20,788	19,143
Interest income	37	30
Interest expense	(4,525)	(4,347)
Other income (expense), net	2	826
Income before income taxes	16,302	15,652
Provision for income taxes	5,716	6,312
Net income	$ 10,586	$ 9,340
Basic income per share	$ 0.21	$ 0.19
Diluted income per share	$ 0.21	$ 0.19
Weighted average shares used in per share calculations:
Basic (in shares)	49,631	49,374
Diluted (in shares)	50,247	50,189