Nature of Operations and Summary of Significant Accounting Policies Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Finite-lived intangible assets	$ 165,449	$ 158,438
Finite-lived assets, accumulated amortization	(67,246)	(53,919)
Goodwill	288,770	275,252
Indefinite-lived intangible assets, including Goodwill	331,120	316,233
Amortization expense for intangible assets
Amortization expense	13,376	11,049	10,716
Goodwill increase (decrease)	13,518
Goodwill acquired during period	14,585
Foreign currency translation adjustments, due to aquisitions, impact on Goodwill	(1,067)
Minimum [Member]
Amortization expense for intangible assets
2012	9,500
2013	9,500
2014	9,500
2015	9,500
2016	9,500
2017	9,500
Maximum [Member]
Amortization expense for intangible assets
2012	13,500
2013	13,500
2014	13,500
2015	13,500
2016	13,500
2017	13,500
Unpatented Technology [Member]
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Finite-lived intangible assets	18,113	15,073
Finite-lived assets, weighted average estimated useful life (years)	9
Finite-lived assets, accumulated amortization	(9,024)	(7,275)
Patents [Member]
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Finite-lived intangible assets	9,080	8,497
Finite-lived assets, weighted average estimated useful life (years)	10
Finite-lived assets, accumulated amortization	(5,434)	(4,304)
Product Names [Member]
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Finite-lived intangible assets	5,638	5,676
Finite-lived assets, weighted average estimated useful life (years)	14
Finite-lived assets, accumulated amortization	(1,818)	(1,285)
Non-compete Agreements [Member]
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Finite-lived intangible assets	2,130	2,130
Finite-lived assets, weighted average estimated useful life (years)	3
Finite-lived assets, accumulated amortization	(2,130)	(1,952)
Customer Relations [Member]
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Finite-lived intangible assets	130,488	127,062
Finite-lived assets, weighted average estimated useful life (years)	13
Finite-lived assets, accumulated amortization	(48,840)	(39,103)
Trademarks and trade names [Member]
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets (Excluding Goodwill)	39,280	37,911
In-process Research and Development
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets (Excluding Goodwill)	$ 3,070	$ 3,070