Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Net Sales	$ 274,574	$ 272,734	$ 728,806	$ 776,143
Cost of sales	205,839	204,847	548,991	585,263
Gross profit	68,735	67,887	179,815	190,880
Selling, general, and administrative expense	33,042	41,365	109,513	118,021
Income from operations	35,693	26,522	70,302	72,859
Interest expense	3,486	3,625	10,612	10,982
Other expense	404	159	811	8,319
Income before taxes	31,803	22,738	58,879	53,558
Provision for income taxes	11,184	8,952	21,090	12,131
Income from continuing operations	20,619	13,786	37,789	41,427
Discontinued operations:
Loss before taxes	0	0	(644)	0
Benefit of income taxes	0	0	(239)	0
Loss from discontinued operations	0	0	(405)	0
Net income	$ 20,619	$ 13,786	$ 37,384	$ 41,427
Net earnings per share – Basic:
Income from continuing operations, per basic share (in USD per share)	$ 0.65	$ 0.44	$ 1.19	$ 1.32
Loss from discontinued operations per basic share (in USD per share)	0.00	0.00	(0.01)	0.00
Net earnings per share - Basic (in USD per share)	0.65	0.44	1.18	1.32
Net earnings per share - Diluted
Income from continuing operations, per diluted share (in USD per share)	0.64	0.43	1.17	1.29
Loss from discontinued operation per diluted share (in USD per share)	0.00	0.00	(0.01)	0.00
Net earnings per share - Diluted (in USD per share)	$ 0.64	$ 0.43	$ 1.16	$ 1.29
Weighted Average Number of Shares Outstanding
Weighted average basic shares outstanding (in shares)	31,703	31,579	31,700	31,493
Weighted average shares outstanding, diluted (in shares)	32,210	32,176	32,216	32,005