Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Net sales	$ 828,343	$ 649,468	$ 600,468
Cost of goods sold	600,432	471,254	435,689
Gross profit	227,911	178,214	164,779
Selling, general and administrative expenses	171,479	123,422	114,141
Pension expense	8,139	7,480	3,739
Goodwill impairment charges	24,254	0	0
Asset impairment charges	8,990	1,398	1,179
Operating income	15,049	45,914	45,720
Other:
Interest expense	7,198	4,598	7,544
Realized and unrealized gain on derivatives	(148)	(588)	(1,307)
Other (income) expense	(376)	384	181
Income from continuing operations before tax and equity investment	8,375	41,520	39,302
Tax provision	13,893	17,997	17,008
Loss from associated company, net of tax	5,426	6,532	7,101
(Loss) income from continuing operations, net of tax	(10,944)	16,991	15,193
Discontinued operations:
Income from discontinued operations, net of tax	0	565	9,935
Gain on disposal of assets, net of tax	0	88,807	42
Net income from discontinued operations	0	89,372	9,977
Net (loss) income	$ (10,944)	$ 106,363	$ 25,170
Basic and diluted (loss) income per share of common stock
(Loss) income from continuing operations, net of tax, per share (in dollars per share)	$ (0.89)	$ 1.49	$ 1.23
Discontinued operations, net of tax, per share (in dollars per share)	0.00	7.86	0.81
Net (loss) income per share (in dollars per share)	$ (0.89)	$ 9.35	$ 2.04
Weighted-average number of common shares outstanding (in shares)	12,242	11,380	12,334