Acquisitions (Schedule Of Acquired Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Business Acquisition [Line Items]
Fair Value	$ 10,183	$ 35,401
Trademarks [Member]
Business Acquisition [Line Items]
Fair Value	2,110	11,470
Estimated Useful Life	Indefinite	Indefinite
Unpatented Technology And Patents [Member]
Business Acquisition [Line Items]
Fair Value	2,310	16,560
Estimated Useful Life	15 years	15 years
Customer Relationships [Member]
Business Acquisition [Line Items]
Fair Value	4,484
Backlog [Member]
Business Acquisition [Line Items]
Fair Value	130	1,200
Estimated Useful Life	6 months	1 year 6 months
Non-Compete Agreements [Member]
Business Acquisition [Line Items]
Fair Value	350	201
Estimated Useful Life		4 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
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
Estimated Useful Life 5 Years [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Fair Value	799
Estimated Useful Life	5 years
Estimated Useful Life 16 Years [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Fair Value		$ 5,970
Estimated Useful Life		16 years