Goodwill and Other Intangible Assets (Schedule Of Components Of Other Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 72,855	$ 71,455
Accumulated Amortization	(37,327)	(35,832)
Total	35,528	35,623
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	51,755	51,755
Accumulated Amortization	(30,629)	(29,402)
Total	21,126	22,353
Useful Lives (in years)	11 years	11 years
Trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	15,400	15,400
Accumulated Amortization	(4,010)	(3,850)
Total	11,390	11,550
Useful Lives (in years)	24 years	24 years
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,300	4,300
Accumulated Amortization	(2,688)	(2,580)
Total	$ 1,612	$ 1,720
Useful Lives (in years)	10 years	10 years