Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified													9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Sep. 30, 2012 Customer Relationships [Member]	Dec. 31, 2011 Customer Relationships [Member]	Sep. 30, 2012 Patents [Member]	Dec. 31, 2011 Patents [Member]	Sep. 30, 2012 Tradenames [Member]	Dec. 31, 2011 Tradenames [Member]	Sep. 30, 2012 Non-Compete Agreements [Member]	Dec. 31, 2011 Non-Compete Agreements [Member]	Sep. 30, 2012 Other Indentifiable Intangible Assets [Member]	Sep. 30, 2012 Minimum [Member] Customer Relationships [Member]	Dec. 31, 2011 Minimum [Member] Customer Relationships [Member]	Sep. 30, 2012 Minimum [Member] Patents [Member]	Dec. 31, 2011 Minimum [Member] Patents [Member]	Sep. 30, 2012 Minimum [Member] Tradenames [Member]	Dec. 31, 2011 Minimum [Member] Tradenames [Member]	Sep. 30, 2012 Minimum [Member] Non-Compete Agreements [Member]	Dec. 31, 2011 Minimum [Member] Non-Compete Agreements [Member]	Sep. 30, 2012 Maximum [Member] Customer Relationships [Member]	Dec. 31, 2011 Maximum [Member] Customer Relationships [Member]	Sep. 30, 2012 Maximum [Member] Patents [Member]	Dec. 31, 2011 Maximum [Member] Patents [Member]	Sep. 30, 2012 Maximum [Member] Tradenames [Member]	Dec. 31, 2011 Maximum [Member] Tradenames [Member]	Sep. 30, 2012 Maximum [Member] Non-Compete Agreements [Member]	Dec. 31, 2011 Maximum [Member] Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Cost		$ 108,989		$ 50,105	$ 50,645	$ 45,934	$ 46,139	$ 7,959	$ 8,069	$ 4,988	$ 4,136	$ 108,986
Accumulated Amortization		29,930		16,782	14,483	13,994	10,651	4,243	3,408	2,212	1,388	37,231
Net Balance	$ 71,755	$ 79,059	$ 80,746	$ 33,323	$ 36,162	$ 31,940	$ 35,488	$ 3,716	$ 4,661	$ 2,776	$ 2,748	$ 71,755
Estimated Useful Life in Years													3 years	3 years	2 years	2 years	5 years	5 years	1 year	3 years	16 years	16 years	19 years	19 years	15 years	15 years	7 years	7 years