Hedging Activities And Fair Value Measurements (Narrative) (Details)	3 Months Ended			12 Months Ended
	Mar. 31, 2012 USD ($)	Mar. 31, 2012 EUR (€)	Mar. 31, 2011 USD ($)	Dec. 31, 2011 EUR (€)	Dec. 31, 2011 USD ($)
Hedging Activities And Fair Value Measurements [Abstract]
Borrowings resulting in interest rate risk	$ 404,400,000
Foreign currency contracts maturity period, years	1	1
Number of fixed rate payor on interest rate swap contracts	4	4
Variable rate borrowings	100,000,000	20,000,000
Variable interest rate, lower range	0.50%	0.50%
Variable interest rate, higher range	2.20%	2.20%
Lower expiration dates	2012	2012
Higher expiration dates	2013	2013
Expected reclassification of losses out of AOCI into earnings during the next 12 months	700,000
Variable rate borrowings outstanding	325,400,000	36,000,000
Number of foreign currency forward contracts outstanding	40	40
Notional amounts, lower range	100,000
Notional amounts, higher range	164,900,000
Portion of EURO Term Loan designated as net investment hedge		36,000,000		37,600,000
Net gains (losses) from foreign currency forward contracts	(29,000)		(400,000)
Total net foreign currency gains (losses)	(1,500,000)		(1,200,000)
Amount of loss recognized in other comprehensive income	(900,000)		0
Net balances of term loan designated as hedge included in accumulated other comprehensive income, net of tax	$ (3,300,000)				$ (2,300,000)