Goodwill and Related Intangible Assets (Schedule Of Acquired Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified															3 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Trademarks	Dec. 31, 2013 Trademarks	Sep. 30, 2014 Unpatented technology	Dec. 31, 2013 Unpatented technology	Sep. 30, 2014 Customer relationships	Dec. 31, 2013 Customer relationships	Sep. 30, 2014 Non-compete agreements	Dec. 31, 2013 Non-compete agreements	Sep. 30, 2014 Backlog	Dec. 31, 2013 Backlog	Sep. 30, 2014 Trademarks	Dec. 31, 2013 Trademarks	Sep. 30, 2014 Minimum Trademarks	Sep. 30, 2014 Minimum Unpatented technology	Sep. 30, 2014 Minimum Customer relationships	Sep. 30, 2014 Minimum Non-compete agreements	Sep. 30, 2014 Minimum Backlog	Sep. 30, 2014 Maximum Trademarks	Sep. 30, 2014 Maximum Unpatented technology	Sep. 30, 2014 Maximum Customer relationships	Sep. 30, 2014 Maximum Non-compete agreements	Sep. 30, 2014 Maximum Backlog
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Indefinite-lived intangible assets													$ 45,576	$ 45,724
Gross Carrying Amount, Finite-lived intangible assets	85,657	86,117	3,937	3,989	24,690	24,690	53,763	54,171	1,937	1,937	1,330	1,330
Total acquired intangible assets, Gross Carrying Amount	131,233	131,841
Accumulated Amortization, Indefinite-lived intangible assets													0	0
Accumulated Amortization, Finite-lived intangible assets	43,974	40,064	1,732	1,420	8,321	6,980	31,069	28,926	1,522	1,408	1,330	1,330
Total acquired intangible assets, Accumulated Amortization	$ 43,974	$ 40,064
Estimated Life															2 years	5 years	5 years	4 years	1 year	15 years	20 years	16 years	10 years	2 years