Condensed Consolidated Statement of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Statement [Abstract]
Net sales	$ 187,213	$ 187,453	$ 351,349	$ 340,782
Cost of goods sold	132,439	139,578	252,616	253,881
Gross profit	54,774	47,875	98,733	86,901
Selling, general and administrative expenses	32,657	29,866	64,527	58,788
Pension expense	652	1,125	1,264	2,250
Asset impairment charge	0	10	0	700
Operating income	21,465	16,874	32,942	25,163
Other:
Interest expense	4,350	3,297	8,199	7,626
Realized and unrealized gain on derivatives	(1,612)	(5,019)	(2,510)	(855)
Other expense (income)	152	26	196	(5)
Income from continuing operations before tax	18,575	18,570	27,057	18,397
Tax provision	7,623	1,529	11,009	2,535
Income from continuing operations, net of tax	10,952	17,041	16,048	15,862
Discontinued Operations:
Loss from discontinued operations, net of tax	0	(127)	0	(709)
Gain on disposal of assets, net of tax	0	(154)	0	6,431
Net income (loss) from discontinued operations	0	(281)	0	5,722
Net income	$ 10,952	$ 16,760	$ 16,048	$ 21,584
Basic and diluted per share of common stock
Income from continuing operations, net of tax, per share	$ 0.83	$ 1.35	$ 1.24	$ 1.27
Discontinued operations, net of tax, per share	$ 0.00	$ (0.03)	$ 0.00	$ 0.46
Net income per share	$ 0.83	$ 1.32	$ 1.24	$ 1.73
Weighted average number of common shares outstanding	13,144	12,651	12,918	12,468