Fair Value Measurements (Reconciliation Of Subordinate Tax Increment Revenue Bonds Using Significant Unobservable Inputs (Level 3)) (Details) (USD $) In Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2011		Dec. 31, 2010
Fair Value Measurements [Abstract]
Outstanding beginning balance	$ 10,700
Additions			22,417	[1]
Loss included in earnings			(11,717)	[2]
Settlement of recalled bonds	(10,700)	[3]
Outstanding ending balance			$ 10,700

[1] Additions represent an investment including accrued interest in subordinate tax increment revenue bonds that was classified as available for sale on December 31, 2010.

[2] Represents the change in net unrealized losses recognized in impairment loss in the Statement of Consolidated Income and Comprehensive Income for the year ended December 31, 2010.

[3] Settlement of recalled bonds represents the recall of previously issued subordinated tax increment revenue bonds that were available for sale and were replaced with held to maturity subordinated tax increment revenue bonds associated with the exchange transaction in April 2011.