Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Jun. 30, 2015
PROPERTIES:
Accumulated depreciation on operating properties	$ 324,543	$ 360,700
Development in Process, Accumulated Depreciation	0	0
Real Estate Held for Sale, Accumulated Depreciation	0	20,884
Allowance for doubtful accounts for notes and other receivables	1,643	2,006
Intangible Liabilities, Accumulated Amortization	16,897	21,925
Finite-Lived Intangible Assets, Accumulated Amortization	$ 76,050	$ 88,776
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	350,000,000
Common stock, shares issued	220,082,610	220,255,502
Treasury stock, shares	3,570,082	3,570,082
Preferred stock, dividend rate	0.00%
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Preferred stock, liquidation preference	$ 0