Other Intangibles (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	$ 153,418,000	$ 129,558,000
Finite-Lived Intangible Assets, Accumulated Amortization	70,098,000	58,647,000
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	94,790,000	72,998,000
Finite-Lived Intangible Assets, Accumulated Amortization	50,832,000	40,071,000
Licensing Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	3,160,000	3,183,000
Finite-Lived Intangible Assets, Accumulated Amortization	3,160,000	2,958,000
Developed Technology Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	9,823,000	8,521,000
Finite-Lived Intangible Assets, Accumulated Amortization	4,870,000	3,988,000
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	6,358,000	7,518,000
Finite-Lived Intangible Assets, Accumulated Amortization	5,266,000	5,863,000
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	7,510,000	6,092,000
Finite-Lived Intangible Assets, Accumulated Amortization	5,970,000	5,767,000
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	0	0
Indefinite-lived Intangible Assets	$ 31,777,000	$ 31,246,000