Goodwill and Related Intangible Assets (Schedule Of Acquired Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified															3 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Trademarks	Dec. 31, 2013 Trademarks	Jun. 30, 2014 Unpatented technology	Dec. 31, 2013 Unpatented technology	Jun. 30, 2014 Customer relationships	Dec. 31, 2013 Customer relationships	Jun. 30, 2014 Non-compete agreements	Dec. 31, 2013 Non-compete agreements	Jun. 30, 2014 Backlog	Dec. 31, 2013 Backlog	Jun. 30, 2014 Trademarks	Dec. 31, 2013 Trademarks	Jun. 30, 2014 Minimum Trademarks	Jun. 30, 2014 Minimum Unpatented technology	Jun. 30, 2014 Minimum Customer relationships	Jun. 30, 2014 Minimum Non-compete agreements	Jun. 30, 2014 Minimum Backlog	Jun. 30, 2014 Maximum Trademarks	Jun. 30, 2014 Maximum Unpatented technology	Jun. 30, 2014 Maximum Customer relationships	Jun. 30, 2014 Maximum Non-compete agreements	Jun. 30, 2014 Maximum Backlog
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Indefinite-lived intangible assets													$ 45,791	$ 45,724
Gross Carrying Amount, Finite-lived intangible assets	86,232	86,117	3,996	3,989	24,690	24,690	54,279	54,171	1,937	1,937	1,330	1,330
Total acquired intangible assets, Gross Carrying Amount	132,023	131,841
Accumulated Amortization, Indefinite-lived intangible assets													0	0
Accumulated Amortization, Finite-lived intangible assets	43,049	40,064	1,636	1,420	7,874	6,980	30,716	28,926	1,493	1,408	1,330	1,330
Total acquired intangible assets, Accumulated Amortization	$ 43,049	$ 40,064
Estimated Life															2 years	5 years	5 years	4 years	1 year	15 years	20 years	16 years	10 years	2 years