Fair Values Of Assets And Liabilities Level 3 Rollforward (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Swap Agreements - Assets	$ 301		$ 301			$ 2,004
Interest Rate Swap Agreements - Liabilities	301		301			6,440
Interest Rate Swap [Member] | Other Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(69)	23	(161)	260
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	(11)	(1,078)	(66)	(1,930)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	235	8,725	6,366	32,417
Interest Rate Swap [Member] | Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Swap Agreements - Assets	301	8,660	301	8,660	454	2,004	12,577	23,058
Interest Rate Swap Agreements - Liabilities	(301)	(16,050)	(301)	(16,050)	(456)	(6,440)	(23,720)	(46,797)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	14	1,005	153	1,058
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	$ (167)	$ (4,922)	$ (1,856)	$ (15,456)