Derivative Instruments And Hedging (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Derivative [Line Items]
Estimated net amount of gains expected to be reclassified out of accumulated other comprehensive income and into earnings within next 12 months	$ 1.5
General duration of foreign currency exchange contracts	less than 24 months
Interest Rate Swap Effective On March 30, 2012 [Member]
Derivative [Line Items]
Fixed portion of interest rate associated with interest rate swap	1.36%
Credit Facility borrowings hedged	40
Interest Rate Swap Effective On March 30, 2010 [Member]
Derivative [Line Items]
Fixed portion of interest rate associated with interest rate swap	2.00%
Credit Facility borrowings hedged	80
Interest Rate Swap Effective On March 28, 2013 [Member]
Derivative [Line Items]
Fixed portion of interest rate associated with interest rate swap	1.64%
Credit Facility borrowings hedged	$ 40