Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Net Sales	$ 247,627	$ 265,738	$ 454,232	$ 503,409
Cost of sales	185,802	196,895	343,152	380,416
Gross profit	61,825	68,843	111,080	122,993
Selling, general, and administrative expense	36,895	40,267	76,471	76,656
Income from operations	24,930	28,576	34,609	46,337
Interest expense	3,550	3,666	7,126	7,357
Other expense	353	8,195	407	8,160
Income before taxes	21,027	16,715	27,076	30,820
Provision for (benefit of) income taxes	7,853	(1,897)	9,906	3,179
Income from continuing operations	13,174	18,612	17,170	27,641
Discontinued operations:
Loss before taxes	(644)	0	(644)	0
Benefit of income taxes	(239)	0	(239)	0
Loss from discontinued operations	(405)	0	(405)	0
Net income	$ 12,769	$ 18,612	$ 16,765	$ 27,641
Net earnings per share – Basic:
Income from continuing operations, per basic share (in USD per share)	$ 0.41	$ 0.59	$ 0.54	$ 0.88
Loss from discontinued operations per basic share (in USD per share)	(0.01)	0.00	(0.01)	0.00
Net earnings per share - Basic (in USD per share)	0.40	0.59	0.53	0.88
Net earnings per share - Diluted
Income from continuing operations, per diluted share (in USD per share)	0.41	0.58	0.53	0.87
Loss from discontinued operation per diluted share (in USD per share)	(0.01)	0.00	(0.01)	0.00
Net earnings per share - Diluted (in USD per share)	$ 0.40	$ 0.58	$ 0.52	$ 0.87
Weighted Average Number of Shares Outstanding
Weighted average basic shares outstanding (in shares)	31,709	31,475	31,698	31,447
Weighted average shares outstanding, diluted (in shares)	32,183	32,007	32,219	31,916