Consolidated Income Statements (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Net sales	$ 137,982	$ 135,487
Cost of goods sold	99,603	98,336
Gross profit	38,379	37,151
Selling, general and administrative expenses	30,861	30,693
Pension expense	2,072	1,105
Operating income	5,446	5,353
Other:
Interest expense	1,167	1,546
Realized and unrealized loss (gain) on derivatives	207	(140)
Other expense	93	69
Income from continuing operations before tax and equity investment	3,979	3,878
Tax provision	1,643	1,806
(Gain) loss from associated company, net of tax	(922)	5,298
Income (loss) from continuing operations, net of tax	3,258	(3,226)
Discontinued operations:
Income from discontinued operations, net of tax	565	2,814
Gain on disposal of assets, net of tax	89,521	42
Net income from discontinued operations	90,086	2,856
Net income (loss)	$ 93,344	$ (370)
Basic and diluted income (loss) per share of common stock (in dollars per share)
Income (loss) from continuing operations, net of tax, per share	$ 0.30	$ (0.25)
Discontinued operations, net of tax, per share	$ 8.36	$ 0.22
Net income (loss) per share	$ 8.66	$ (0.03)
Weighted-average number of common shares outstanding (in shares)	10,780	12,995