Derivative Financial Instruments And Hedging Activities Derivative (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2010
Derivative [Line Items]
Unrealized Gains (Losses) on Interest Rate Swap Agreements Designated as Hedges				$ 2,400,000
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments			200,000
Restricted Cash - Derivative Collateral			4,200,000	35,500,000
Interest Rate Swap [Member] | Other Assets [Member]
Derivative [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	$ 1,194,000	$ 5,417,000	$ 152,000	$ (1,676,000)	$ 12,595,000