UNCONSOLIDATED AFFILIATES AND COST METHOD INVESTMENT (Summarized Financial Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Equity Method Investment, Summarized Financial Information, Balance Sheet [Abstract]
Investment in real estate assets	$ 2,137,666	$ 2,357,902
Accumulated depreciation	(564,612)	(677,448)
Investment in real estate, net	1,573,054	1,680,454
Developments in progress	9,210	59,592
Net investment in real estate assets	1,582,264	1,740,046
Other assets	223,347	168,540
Total assets	1,805,611	1,908,586
Mortgage and other indebtedness	1,266,046	1,546,272
Other liabilities	46,160	51,357
Total liabilities	1,312,206	1,597,629
The Company	228,313	184,868
Other investors	265,092	126,089
Total owners' equity	493,405	310,957
Total liabilities and owners’ equity	1,805,611	1,908,586
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]
Total revenues	250,361	253,399	$ 250,248
Depreciation and amortization	(83,640)	(79,870)	(79,059)
Other operating expenses	(76,328)	(75,875)	(73,218)
Income from operations	90,393	97,654	97,971
Interest and other income	1,352	1,337	1,358
Interest expense	(55,227)	(75,485)	(74,754)
Gain on extinguishment of debt	62,901	0	0
Gain on sales of real estate assets	160,977	2,551	1,697
Net income	$ 260,396	$ 26,057	$ 26,272