Fair Value Measurements (Schedule Of Fair Value Disclosures) (Details) (USD $)	Mar. 31, 2014		Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Credit loss recognized	$ 31,000,000		$ 31,000,000
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable from real estate joint ventures and partnerships	12,834,000		13,330,000
Tax increment revenue bonds	25,392,000	[1]	25,850,000	[1]
Fair Value [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	12,647,000		13,549,000
Tax increment revenue bonds	25,392,000	[1]	25,850,000	[1]
Fixed-Rate Debt [Member] | Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	1,823,554,000		2,136,265,000
Fixed-Rate Debt [Member] | Fair Value [Member] | Fair Value Using Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	1,857,774,000		2,150,891,000
Variable-Rate Debt [Member] | Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	272,513,000		163,579,000
Variable-Rate Debt [Member] | Fair Value [Member] | Fair Value Using Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	$ 281,482,000		$ 172,349,000

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