Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended				12 Months Ended									12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2007	Dec. 31, 2011 Automotive [Member]	Dec. 31, 2010 Automotive [Member]	Dec. 31, 2009 Automotive [Member]	Dec. 31, 2011 Industrial [Member]	Dec. 31, 2010 Industrial [Member]	Dec. 31, 2009 Industrial [Member]	Dec. 31, 2011 Office products [Member]	Dec. 31, 2009 Office products [Member]	Dec. 31, 2008 Office products [Member]	Dec. 31, 2011 Electrical/electronic materials [Member]	Dec. 31, 2010 Electrical/electronic materials [Member]	Dec. 31, 2008 Electrical/electronic materials [Member]
Summary of Goodwill and Other Intangible Assets
Beginning Balance - Goodwill					$ 44,271	$ 43,114	$ 40,212	$ 86,810	$ 76,354	$ 70,836	$ 10,554	$ 10,554	$ 10,554	$ 8,647	$ 2,870	$ 2,870
Beginning Balance - Finite-Lived Intangible Assets	59,266	38,640	34,353
Beginning Balance - Total	209,548	171,532	158,825	82,453
Goodwill, Additions					0		2	12,379	10,178	5,518	0			15,703	5,777
Finite lived intangible asset acquired during period, Additions	50,128	24,292	6,679
Goodwill and intangible assets acquired during period, Additions	78,210	40,247	12,199
Amortization	(6,774)	(4,737)	(3,644)
Foreign currency translation					(566)	1,157	2,900	(178)	278		0			0
Finite lived intangible assets during period, Foreign Currency Translation	(465)	1,071	1,252
Goodwill and finite lived intangible assets during period, Foreign Currency Translation	(1,209)	2,506	4,152
Ending Balance - Goodwill					43,705	44,271	43,114	99,011	86,810	76,354	10,554	10,554	10,554	24,350	8,647	2,870
Ending Balance - Finite-Lived Intangible Assets	102,155	59,266	38,640
Ending Balance - Total	$ 279,775	$ 209,548	$ 171,532	$ 82,453