CONSOLIDATED FUNDS AND VENTURES (Details 7) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Expenses:
Interest expense	$ 13,726	[1]	$ 6,675	[1]	$ 20,015	[1]	$ 13,532	[1]
Net gains (losses) related to CFVs:
Derivative gains (losses)	921		(898)		2,105		(1,150)
Equity in losses from Lower Tier Property Partnerships of CFVs					(13,783)		(19,431)
Net gain (loss)	(5,550)		(1,418)		35,957		(10,296)
Consolidated Funds and Ventures [Member]
Revenue:
Rental and other income from real estate	6,366		4,188		11,653		7,916
Interest and other income	3,784		2,380		4,744		3,222
Total revenue from CFVs	10,150		6,568		16,397		11,138
Expenses:
Depreciation and amortization	2,843		2,071		5,353		4,054
Interest expense	477		398		975		796
Other operating expenses	4,978		3,615		9,337		7,198
Foreign currency loss	3,395		1,461		7,550		818
Asset impairments	4,857		1,149		7,881		5,282
Total expenses from CFVs	16,550		8,694		31,096		18,148
Net gains (losses) related to CFVs:
Unrealized gains on investments	5,940		4,217		17,296		9,990
Derivative gains (losses)	2,994		1,073		6,625		195
Net loss on sale of properties	0		0		0		(170)
Equity in losses from Lower Tier Property Partnerships of CFVs	(7,368)		(6,895)		(13,786)		(19,431)
Net gain (loss)	(4,835)		(3,731)		(4,565)		(16,426)
Net losses allocable to noncontrolling interests in CFVs	6,572	[2]	5,319	[2]	7,387	[2]	19,613	[2]
Net income allocable to the common shareholders related to CFVs	$ 1,737		$ 1,588		$ 2,822		$ 3,187

[1] Represents interest expense related to debt which finances interest-bearing assets. See Note 6, “Debt.”

[2] Net losses allocable to noncontrolling interests in CFVs have been adjusted to exclude noncontrolling interests related to IHS.