Goodwill And Related Intangible Assets (Schedule Of Acquired Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified													9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Amortizable Trademarks [Member]	Dec. 31, 2012 Amortizable Trademarks [Member]	Sep. 30, 2013 Unpatented Technology And Patents [Member]	Dec. 31, 2012 Unpatented Technology And Patents [Member]	Sep. 30, 2013 Customer Relationships [Member]	Dec. 31, 2012 Customer Relationships [Member]	Sep. 30, 2013 Non-Compete Agreements [Member]	Dec. 31, 2012 Non-Compete Agreements [Member]	Sep. 30, 2013 Backlog [Member]	Dec. 31, 2012 Backlog [Member]	Sep. 30, 2013 Minimum [Member] Amortizable Trademarks [Member]	Sep. 30, 2013 Minimum [Member] Unpatented Technology And Patents [Member]	Sep. 30, 2013 Minimum [Member] Customer Relationships [Member]	Sep. 30, 2013 Minimum [Member] Non-Compete Agreements [Member]	Sep. 30, 2013 Minimum [Member] Backlog [Member]	Sep. 30, 2013 Maximum [Member] Amortizable Trademarks [Member]	Sep. 30, 2013 Maximum [Member] Unpatented Technology And Patents [Member]	Sep. 30, 2013 Maximum [Member] Customer Relationships [Member]	Sep. 30, 2013 Maximum [Member] Non-Compete Agreements [Member]	Sep. 30, 2013 Maximum [Member] Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Indefinite-lived intangible assets			$ 45,649	$ 48,774
Gross Carrying Amount, Finite-lived intangible assets	86,111	84,778	4,034	2,771	24,690	24,427	54,120	53,043	1,937	3,207	1,330	1,330
Total acquired intangible assets, Gross Carrying Amount	131,760	133,552
Accumulated Amortization, Indefinite-lived intangible assets
Accumulated Amortization, Finite-lived intangible assets	38,426	34,793	1,312	1,085	6,533	5,204	27,889	24,687	1,362	2,598	1,330	1,219
Total acquired intangible assets, Accumulated Amortization	$ 38,426	$ 34,793
Estimated Life													2 years	5 years	5 years	4 years	6 months	15 years	20 years	16 years	10 years	2 years