Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
PROPERTIES:
Accumulated depreciation on operating properties	$ 258,752		$ 235,707
Development in Process, Accumulated Depreciation	0		0
Real Estate Held for Sale, Accumulated Depreciation	12,001		21,444
Allowance for doubtful accounts for notes and other receivables	1,897		1,827
Intangible Liabilities, Accumulated Amortization	9,344		6,323
Finite-Lived Intangible Assets, Accumulated Amortization	$ 49,112		$ 37,544
Preferred stock, 20,000,000 shares authorized, $1 par value:
Preferred stock, par value	$ 1		$ 1
Preferred stock, shares authorized	20,000,000		20,000,000
Common stock, par value	$ 1		$ 1
Common stock, shares authorized	250,000,000		250,000,000
Common stock, shares issued	201,992,661		193,236,454
Treasury stock, shares	3,570,082		3,570,082
Preferred stock, dividend rate	7.50%	7.50%
Preferred stock, shares issued	3,791,000		3,791,000
Preferred stock, shares outstanding	3,791,000		3,791,000
Preferred stock, liquidation preference	$ 25		$ 25