Goodwill And Related Intangible Assets (Schedule Of Acquired Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified													3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Amortizable Trademarks [Member]	Dec. 31, 2013 Amortizable Trademarks [Member]	Mar. 31, 2014 Unpatented Technology And Patents [Member]	Dec. 31, 2013 Unpatented Technology And Patents [Member]	Mar. 31, 2014 Customer Relationships [Member]	Dec. 31, 2013 Customer Relationships [Member]	Mar. 31, 2014 Non-Compete Agreements [Member]	Dec. 31, 2013 Non-Compete Agreements [Member]	Mar. 31, 2014 Backlog [Member]	Dec. 31, 2013 Backlog [Member]	Mar. 31, 2014 Minimum [Member] Amortizable Trademarks [Member]	Mar. 31, 2014 Minimum [Member] Unpatented Technology And Patents [Member]	Mar. 31, 2014 Minimum [Member] Customer Relationships [Member]	Mar. 31, 2014 Minimum [Member] Non-Compete Agreements [Member]	Mar. 31, 2014 Minimum [Member] Backlog [Member]	Mar. 31, 2014 Maximum [Member] Amortizable Trademarks [Member]	Mar. 31, 2014 Maximum [Member] Unpatented Technology And Patents [Member]	Mar. 31, 2014 Maximum [Member] Customer Relationships [Member]	Mar. 31, 2014 Maximum [Member] Non-Compete Agreements [Member]	Mar. 31, 2014 Maximum [Member] Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Indefinite-lived intangible assets			$ 45,744	$ 45,724
Gross Carrying Amount, Finite-lived intangible assets	86,036	86,117	3,950	3,989	24,690	24,690	54,129	54,171	1,937	1,937	1,330	1,330
Total acquired intangible assets, Gross Carrying Amount	131,780	131,841
Accumulated Amortization, Indefinite-lived intangible assets
Accumulated Amortization, Finite-lived intangible assets	41,486	40,064	1,525	1,420	7,428	6,980	29,750	28,926	1,453	1,408	1,330	1,330
Total acquired intangible assets, Accumulated Amortization	$ 41,486	$ 40,064
Estimated Life													2 years	5 years	5 years	4 years	1 year	15 years	20 years	16 years	10 years	2 years