Derivative Instruments (Changes In Accumulated OCI Relating To Derivative Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Derivative Instruments [Abstract]
Accumulated OCI derivative loss January 1, 2012	$ 1,359
Effective portion of changes in fair value	223
Reclassifications from accumulated OCI derivative loss to earnings	(437)	[1]	(650)	[1]
Foreign currency translation	(27)
Accumulated OCI derivative loss at March 31, 2012	$ 1,118

[1] Assuming market rates remain constant with the rates at March 31, 2012, a loss of $1.4 million is expected to be recognized in earnings over the next 12 months.