Basis of Presentation (Schedule of Modified Income Statement Data) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net sales	$ 188,553	$ 206,722
Cost of goods sold	116,719	117,877
Gross profit	71,834	88,845
Selling, general, and administrative expenses	48,815	47,476
Technical, product engineering, and research expenses	12,939	14,354
Restructuring and other, net	258	34
Pension settlement expense	9,175
Operating income	647	26,981
Interest expense, net	4,644	4,776
Other expense, net	4,548	4,813
(Loss)/income before income taxes	(8,545)	17,392
Income tax (benefit)/expense	(9,379)	3,988
Income from continuing operations	834	13,404
Income from operations of discontinued business	460	4,650
Gain on sale of discontinued business	57,968
Income taxes on discontinued operations	12,221	1,321
Income from discontinued operations	46,207	3,329
Net income	47,041	16,733
Earnings per share - Basic
(Loss)/income from continuing operations	$ 0.03	$ 0.43
Discontinued operations	$ 1.47	$ 0.11
Net income	$ 1.5	$ 0.54
Earnings per share - Diluted
(Loss)/income from continuing operations	$ 0.03	$ 0.43
Discontinued operations	$ 1.46	$ 0.1
Net income	$ 1.49	$ 0.53
Shares used in computing earnings per share:
Basic	31,309	31,223
Diluted	31,533	31,384
Scenario, Previously Reported [Member]
Net sales		251,850
Cost of goods sold		146,857
Gross profit		104,993
Selling, general, and administrative expenses		57,765
Technical, product engineering, and research expenses		15,135
Restructuring and other, net		186
Pension settlement expense
Operating income		31,907
Interest expense, net		4,776
Other expense, net		4,869
(Loss)/income before income taxes		22,262
Income tax (benefit)/expense		5,309
Income from continuing operations before earnings of associated companies		16,953
Equity in losses from associated companies		220
Income from continuing operations		16,733
Income from operations of discontinued business
Gain on sale of discontinued business
Income taxes on discontinued operations
Income from discontinued operations
Net income		16,733
Earnings per share - Basic
(Loss)/income from continuing operations		$ 0.54
Discontinued operations		$ 0.0
Net income		$ 0.54
Earnings per share - Diluted
(Loss)/income from continuing operations		$ 0.54
Discontinued operations		$ 0.0
Net income		$ 0.54
Shares used in computing earnings per share:
Basic		31,223
Diluted		31,384
Reclassify ADS to Discontinued Operations [Member]
Net sales		(45,128)
Cost of goods sold		(28,980)
Gross profit		(16,148)
Selling, general, and administrative expenses		(10,289)
Technical, product engineering, and research expenses		(781)
Restructuring and other, net		(152)
Pension settlement expense
Operating income		(4,926)
Interest expense, net
Other expense, net		(49)
(Loss)/income before income taxes		(4,877)
Income tax (benefit)/expense		(1,321)
Income from continuing operations before earnings of associated companies		(3,556)
Equity in losses from associated companies		(227)
Income from continuing operations		(3,329)
Income from operations of discontinued business		4,650
Gain on sale of discontinued business
Income taxes on discontinued operations		1,321
Income from discontinued operations		3,329
Net income
Other Reclassifications [Member]
Net sales
Cost of goods sold
Gross profit
Selling, general, and administrative expenses
Technical, product engineering, and research expenses
Restructuring and other, net
Pension settlement expense
Operating income
Interest expense, net
Other expense, net		(7)
(Loss)/income before income taxes		7
Income tax (benefit)/expense
Income from continuing operations before earnings of associated companies		7
Equity in losses from associated companies		7
Income from continuing operations
Income from operations of discontinued business
Gain on sale of discontinued business
Income taxes on discontinued operations
Income from discontinued operations
Net income