Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Minimum Customer Relationships	Dec. 31, 2012 Minimum Customer Relationships	Mar. 31, 2014 Minimum Patents	Dec. 31, 2012 Minimum Patents	Mar. 31, 2014 Minimum Tradenames	Dec. 31, 2012 Minimum Tradenames	Mar. 31, 2014 Minimum Non-Compete Agreements	Dec. 31, 2012 Minimum Non-Compete Agreements	Mar. 31, 2014 Maximum Customer Relationships	Dec. 31, 2012 Maximum Customer Relationships	Mar. 31, 2014 Maximum Patents	Dec. 31, 2012 Maximum Patents	Mar. 31, 2014 Maximum Tradenames	Dec. 31, 2012 Maximum Tradenames	Mar. 31, 2014 Maximum Non-Compete Agreements	Dec. 31, 2012 Maximum Non-Compete Agreements
Finite-Lived Intangible Assets
Gross Cost, Customer relationships	$ 58,460	$ 50,105
Accumulated Amortization, Customer relationships	22,825	21,999
Net Balance, Customer relationships	35,635	28,106
Gross Cost, Patents	46,805	41,651
Accumulated Amortization, Patents	18,300	18,461
Net Balance, Patents	28,505	23,190
Gross Cost, Tradenames	6,273	7,959
Accumulated Amortization, Tradenames	3,740	5,976
Net Balance, Tradenames	2,533	1,983
Gross Cost, Non-compete agreements	3,788	3,866
Accumulated Amortization, Non-compete agreements	1,702	2,210
Net Balance, Non-compete agreements	2,086	1,656
Gross Cost, Purchased research and development	6,697	4,457
Gross Cost, Other intangible assets	122,023	108,038
Accumulated Amortization, Other intangible assets	46,567	48,646
Net Balance, Other intangible assets	$ 75,456	$ 59,392
Estimated useful life in years			6 years	6 years	3 years	3 years	3 years	5 years	3 years	3 years	16 years	16 years	19 years	19 years	15 years	15 years	6 years	6 years