CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (7,487)	$ (11,427)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	74,812	73,583
Amortization of deferred financing costs	1,258	584
Straight-lining of rental income	(19,869)	(15,994)
Amortization of above and below-market leases, net	3,619	(890)
Unrealized gain on interest rate swaps	(6,860)	(11,978)
Realized and unrealized losses (gains) on marketable securities	293	(672)
Realized and unrealized gains, net, on real estate fund investments		(873)
Income from unconsolidated joint ventures	(1,496)	(975)
Loss from unconsolidated real estate funds	326
Distributions of income from unconsolidated real estate funds	79
Distributions of income from unconsolidated joint ventures	1,576	353
Amortization of stock based compensation expense	3,627	3,035
Other non-cash adjustments	842	1,799
Changes in operating assets and liabilities:
Real estate fund investments		(22)
Accounts and other receivables	(1,362)	(5,171)
Deferred charges	(3,617)	(5,545)
Other assets	(26,038)	(19,657)
Accounts payable and accrued expenses	62,019	(8,928)
Deferred income taxes	(714)	322
Other liabilities	1,023	1,792
Net cash provided by (used in) operating activities	82,031	(664)
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions of, and additions to, rental properties	(33,193)	(21,636)
Changes in restricted cash	(600)	1,309
Distributions of capital from unconsolidated joint ventures	8	1
Net cash used in investing activities	(33,785)	(20,326)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving credit facility	40,000
Repayment of revolving credit facility	(20,000)
Contributions from noncontrolling interests		2,430
Dividends paid to common shareholders and unitholders	(25,068)	(35,325)
Distributions to noncontrolling interests		(3,488)
Repayment of notes and mortgages payable	(354)	(337)
Net cash used in financing activities	(5,422)	(36,720)
Net increase (decrease) in cash and cash equivalents	42,824	(57,710)
Cash and cash equivalents at beginning of period	143,884	438,599
Decrease in cash due to deconsolidation of real estate fund investments	(7,987)
Cash and cash equivalents at end of period	178,721	380,889
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash payments for interest	34,083	37,186
Cash payments for income taxes, net of refunds	417	32
(Decrease) increase due to deconsolidation of real estate fund investments:
Real estate fund investments	(416,438)
Loans payable to noncontrolling interests	(45,662)
Investments in unconsolidated real estate funds	27,292
Noncontrolling interests in consolidated real estate funds	(351,035)
Dividends and distributions declared but not yet paid	25,147
Change in value of interest rate swaps	29,867
Common shares issued upon redemption of common units	14,427
Additions to real estate included in accounts payable and accrued expenses	11,064	2,904
Purchases of marketable securities using restricted cash	170	555
Write-off of fully amortized and/or depreciated assets	$ 2,795	$ 66