Goodwill And Related Intangible Assets (Schedule Of Acquired Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified													3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Amortizable Trademarks [Member]	Dec. 31, 2012 Amortizable Trademarks [Member]	Mar. 31, 2013 Unpatented Technology And Patents [Member]	Dec. 31, 2012 Unpatented Technology And Patents [Member]	Mar. 31, 2013 Customer Relationships [Member]	Dec. 31, 2012 Customer Relationships [Member]	Mar. 31, 2013 Non-Compete Agreements [Member]	Dec. 31, 2012 Non-Compete Agreements [Member]	Mar. 31, 2013 Backlog [Member]	Dec. 31, 2012 Backlog [Member]	Mar. 31, 2013 Minimum [Member] Amortizable Trademarks [Member]	Mar. 31, 2013 Minimum [Member] Unpatented Technology And Patents [Member]	Mar. 31, 2013 Minimum [Member] Customer Relationships [Member]	Mar. 31, 2013 Minimum [Member] Non-Compete Agreements [Member]	Mar. 31, 2013 Minimum [Member] Backlog [Member]	Mar. 31, 2013 Maximum [Member] Amortizable Trademarks [Member]	Mar. 31, 2013 Maximum [Member] Unpatented Technology And Patents [Member]	Mar. 31, 2013 Maximum [Member] Customer Relationships [Member]	Mar. 31, 2013 Maximum [Member] Non-Compete Agreements [Member]	Mar. 31, 2013 Maximum [Member] Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Indefinite-lived intangible assets			$ 48,502	$ 48,774
Gross Carrying Amount, Finite-lived intangible assets	84,380	84,778	2,766	2,771	24,430	24,427	52,647	53,043	3,207	3,207	1,330	1,330
Total acquired intangible assets, Gross Carrying Amount	132,882	133,552
Accumulated Amortization, Indefinite-lived intangible assets
Accumulated Amortization, Finite-lived intangible assets	36,173	34,793	1,125	1,085	5,647	5,204	25,442	24,687	2,672	2,598	1,287	1,219
Total acquired intangible assets, Accumulated Amortization	$ 36,173	$ 34,793
Estimated Life													2 years	5 years	5 years	4 years	6 months	15 years	20 years	16 years	10 years	2 years