Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Cost, Customer relationships	50,105	50,645
Accumulated Amortization, Customer relationships	17,857	14,483
Net Balance, Customer relationships	32,248	36,162
Gross Cost, Patents	45,964	46,139
Accumulated Amortization, Patents	14,850	10,651
Net Balance, Patents	31,114	35,488
Gross Cost, Tradenames	7,959	8,069
Accumulated Amortization, Tradenames	4,525	3,408
Net Balance, Tradenames	3,434	4,661
Gross Cost, Non-compete agreements	4,989	4,136
Accumulated Amortization, Non-compete agreements	2,567	1,388
Net Balance, Non-compete agreements	2,422	2,748
Gross Cost, Other intangible assets	109,017	108,989
Accumulated Amortization, Other intangible assets	39,799	29,930
Net Balance, Other intangible assets	69,218	79,059
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	3 years
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