Derivative Financial Instruments And Hedging Activities Derivative (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Derivative [Line Items]
Unrealized Gains (Losses) on Interest Rate Swap Agreements Designated as Hedges	$ (100,000)		$ (100,000)		$ 2,400,000
Gain on Cash Flow Hedge Ineffectiveness	(100,000)	1,100,000	(92,000)	200,000
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	(100,000)		(100,000)
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	48,000	555,000	284,000	160,000
Restricted Cash - Derivative Collateral	6,400,000		6,400,000		35,500,000
Foreign Exchange Contract [Member]
Derivative [Line Items]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments		$ 314,000		$ 127,000