Acquisitions (Schedule Of Acquired Intangible Assets And Weighted Average Amortization Periods) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Acquired Finite-Lived Intangible Assets [Line Items]
2011 acquired intangible assets Total	$ 89,921
Patents [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2011 acquired intangible assets Total	3,017
Weighted Average Life	10
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2011 acquired intangible assets Total	4,168
Weighted Average Life	15
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2011 acquired intangible assets Total	53,895
Weighted Average Life	7
Non-Compete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2011 acquired intangible assets Total	793
Weighted Average Life	2
Unpatented Technology And Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2011 acquired intangible assets Total	$ 28,048
Weighted Average Life	6