Derivative Instruments And Hedging Activities (Gains (Losses) Related To Interest Rate Derivatives Designated As Hedges Of Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments gain (loss) recognized in income, net	$ 216	$ 21
Not Designated As Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments gain (loss) recognized in income, net	(130)	(160)
Derivative instruments gain (loss) recognized in expense, net	(32)	118
Designated As Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments gain (loss) recognized in income, net	130	160
Derivative instruments gain (loss) recognized in expense, net	$ 40	$ (110)