Fair Value Measurements (Schedule Of Fair Value Disclosures) (Details) (USD $)			9 Months Ended
	Sep. 30, 2014 Tax Increment Revenue Bonds [Member]	Dec. 31, 2013 Tax Increment Revenue Bonds [Member]	Sep. 30, 2014 Investments, Held To Maturity [Member]	Sep. 30, 2014 Carrying Value [Member]	Dec. 31, 2013 Carrying Value [Member]	Sep. 30, 2014 Carrying Value [Member] Fixed-Rate Debt [Member]	Dec. 31, 2013 Carrying Value [Member] Fixed-Rate Debt [Member]	Sep. 30, 2014 Carrying Value [Member] Variable-Rate Debt [Member]	Dec. 31, 2013 Carrying Value [Member] Variable-Rate Debt [Member]	Sep. 30, 2014 Carrying Value [Member] Tax Increment Revenue Bonds [Member]		Dec. 31, 2013 Carrying Value [Member] Tax Increment Revenue Bonds [Member]		Sep. 30, 2014 Carrying Value [Member] Investments, Held To Maturity [Member]		Dec. 31, 2013 Carrying Value [Member] Investments, Held To Maturity [Member]	Sep. 30, 2014 Fair Value [Member] Fair Value Using Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2013 Fair Value [Member] Fair Value Using Significant Unobservable Inputs (Level 3) [Member]	Sep. 30, 2014 Fair Value [Member] Fixed-Rate Debt [Member] Fair Value Using Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2013 Fair Value [Member] Fixed-Rate Debt [Member] Fair Value Using Significant Unobservable Inputs (Level 3) [Member]	Sep. 30, 2014 Fair Value [Member] Variable-Rate Debt [Member] Fair Value Using Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2013 Fair Value [Member] Variable-Rate Debt [Member] Fair Value Using Significant Unobservable Inputs (Level 3) [Member]	Sep. 30, 2014 Fair Value [Member] Tax Increment Revenue Bonds [Member] Fair Value Using Significant Unobservable Inputs (Level 3) [Member]		Dec. 31, 2013 Fair Value [Member] Tax Increment Revenue Bonds [Member] Fair Value Using Significant Unobservable Inputs (Level 3) [Member]		Sep. 30, 2014 Fair Value [Member] Investments, Held To Maturity [Member] Fair Value Using Significant Other Observable Inputs (Level 2) [Member]		Sep. 30, 2014 Fair Value [Member] Investments, Held To Maturity [Member] Fair Value Using Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2013 Fair Value [Member] Investments, Held To Maturity [Member] Fair Value Using Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable from real estate joint ventures and partnerships					$ 13,330,000													$ 13,549,000
Investments										25,392,000	[1]	25,850,000	[1]	2,750,000	[2]								25,392,000	[1]	25,850,000	[1]	2,741,000	[2]
Debt						1,676,607,000	2,136,265,000	331,148,000	163,579,000										1,734,523,000	2,150,891,000	338,895,000	172,349,000
Credit loss recognized	31,000,000	31,000,000
Gross unrealized loss			$ 9,000

[1] At September 30, 2014 and December 31, 2013, the credit loss balance on our tax increment revenue bonds was $31.0 million.

[2] Investments held to maturity are recorded at cost and have a gross unrealized loss of $9 thousand as of September 30, 2014.