CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 423	$ (8,279)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	142,099	153,004
Amortization of deferred financing costs	2,663	1,170
Straight-lining of rental income	(44,542)	(32,042)
Amortization of above and below-market leases, net	(3,481)	(1,762)
Unrealized gain on interest rate swaps	(16,933)	(33,725)
Transfer taxes due in connection with the sale of shares by a former joint venture partner		5,872
Realized and unrealized losses (gains) on marketable securities	312	(924)
Realized and unrealized gains, net, on real estate fund investments		(12,136)
Income from unconsolidated joint ventures	(3,499)	(2,986)
Loss from unconsolidated real estate funds	1,286
Distributions of income from unconsolidated real estate funds	84
Distributions of income from unconsolidated joint ventures	4,838	1,993
Amortization of stock-based compensation expense	6,183	4,405
Other non-cash adjustments	957	3,686
Changes in operating assets and liabilities:
Real estate fund investments		(22)
Accounts and other receivables	(165)	(261)
Deferred charges	(7,165)	(12,523)
Other assets	(4,942)	2,721
Accounts payable and accrued expenses	54,937	(7,635)
Deferred income taxes	(2,287)	(202)
Other liabilities	1,066	1,972
Net cash provided by operating activities	131,834	62,326
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to rental properties	(73,840)	(41,914)
Changes in restricted cash	12,512	9,550
Distributions of capital from unconsolidated real estate funds	116
Distributions of capital from unconsolidated joint ventures	26
Net cash used in investing activities	(61,186)	(32,364)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from notes and mortgages payable	506,627
Repayments of notes and mortgages payable	(414,202)	(678)
Proceeds from revolving credit facility	60,000
Repayments of revolving credit facility	(60,000)
Dividends paid to common shareholders	(40,390)	(28,422)
Settlement of swap liabilities	(16,040)
Distributions paid to unitholders	(9,824)	(6,903)
Debt issuance costs	(6,487)
Distributions to noncontrolling interests	(1,740)	(5,673)
Contributions from noncontrolling interests		11,203
Net cash provided by (used in) financing activities	17,944	(30,473)
Net increase (decrease) in cash and cash equivalents	88,592	(511)
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	224,489	438,088
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash payments for interest	68,957	78,860
Cash payments for income taxes, net of refunds	1,319	1,213
(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	25,151	25,066
Contributions from noncontrolling interests called but not yet received		2,828
Change in fair value of interest rate swaps	41,614
Common shares issued upon redemption of common units	124,079
Additions to real estate included in accounts payable and accrued expenses	10,678	14,257
Purchases of marketable securities using restricted cash	268	$ (441)
Write-off of fully amortized and/or depreciated assets	$ 5,379