Acquisitions (Schedule Of Acquired Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Fair Value	$ 2,170	$ 10,183
Customer Relationships [Member]
Business Acquisition [Line Items]
Fair Value	1,130	4,470
Estimated Useful Life	15 years
Unpatented Technology And Patents [Member]
Business Acquisition [Line Items]
Fair Value	260	2,313
Estimated Useful Life	15 years	15 years
Amortizable Trademarks [Member]
Business Acquisition [Line Items]
Fair Value		800
Estimated Useful Life		5 years
Non-Compete Agreements [Member]
Business Acquisition [Line Items]
Fair Value	140	340
Estimated Useful Life	5 years
Backlog [Member]
Business Acquisition [Line Items]
Fair Value		130
Estimated Useful Life		6 months
Minimum [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Estimated Useful Life		5 years
Minimum [Member] | Non-Compete Agreements [Member]
Business Acquisition [Line Items]
Estimated Useful Life		5 years
Maximum [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Estimated Useful Life		15 years
Maximum [Member] | Non-Compete Agreements [Member]
Business Acquisition [Line Items]
Estimated Useful Life		10 years
Trademarks [Member]
Business Acquisition [Line Items]
Fair Value	$ 640	$ 2,130
Estimated Useful Life	Indefinite	Indefinite