Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Cost, Customer relationships	$ 50,105	$ 50,105
Accumulated Amortization, Customer relationships	20,963	17,857
Net Balance, Customer relationships	29,142	32,248
Gross Cost, Patents	46,069	45,964
Accumulated Amortization, Patents	17,548	14,850
Net Balance, Patents	28,521	31,114
Gross Cost, Tradenames	7,959	7,959
Accumulated Amortization, Tradenames	5,601	4,525
Net Balance, Tradenames	2,358	3,434
Gross Cost, Non-compete agreements	3,866	4,989
Accumulated Amortization, Non-compete agreements	2,026	2,567
Net Balance, Non-compete agreements	1,840	2,422
Gross Cost, Other intangible assets	107,999	109,017
Accumulated Amortization, Other intangible assets	46,138	39,799
Net Balance, Other intangible assets	$ 61,861	$ 69,218
Minimum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life in Years	3 years	3 years
Minimum [Member] | Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life in Years	2 years	2 years
Minimum [Member] | Tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life in Years	5 years	5 years
Minimum [Member] | Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life in Years	1 year	1 year
Maximum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life in Years	16 years	16 years
Maximum [Member] | Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life in Years	19 years	19 years
Maximum [Member] | Tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life in Years	15 years	15 years
Maximum [Member] | Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life in Years	7 years	7 years