CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 2,715	$ 1,629
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	65,156	62,992
Amortization of deferred financing costs	2,761	2,730
Straight-lining of rental income	(13,244)	(20,147)
Amortization of above and below-market leases, net	(4,420)	(3,008)
Loss on early extinguishment of debt		2,715
Unrealized gain on interest rate swaps		(1,802)
Realized and unrealized losses (gains) on marketable securities	29	(1,607)
Loss (income) from unconsolidated joint ventures	62	(1,937)
Distributions of earnings from unconsolidated joint ventures	600	24
Loss (income) from unconsolidated real estate funds	66	(288)
Distributions of earnings from unconsolidated real estate funds	68	62
Amortization of stock-based compensation expense	6,265	3,429
Other non-cash adjustments	202	(215)
Changes in operating assets and liabilities:
Accounts and other receivables	46	2,687
Deferred charges	(4,427)	(6,654)
Other assets	(26,035)	(13,678)
Accounts payable and accrued expenses	5,325	(8,355)
Other liabilities	400	22,139
Net cash provided by operating activities	35,569	40,716
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to real estate	(25,413)	(15,087)
Investments in unconsolidated joint ventures	(16,115)	(27,857)
Escrow deposits and loans receivable for Residential Development Fund	(15,680)
Purchases of marketable securities	(3,805)	(6,230)
Sales of marketable securities	7,825	4,615
Distributions of capital from unconsolidated real estate funds		3,845
Contributions of capital to unconsolidated real estate funds	(157)
Net cash used in investing activities	(53,345)	(40,714)
CASH FLOWS FROM FINANCING ACTIVITIES:
Contributions from noncontrolling interests	29,920	7,472
Dividends paid to common stockholders	(22,841)	(21,851)
Proceeds from notes and mortgages payable	16,700	991,556
Debt issuance costs	(6,351)	(7,338)
Distributions paid to common unitholders	(2,370)	(3,300)
Distributions to noncontrolling interests	(1,915)	(32,012)
Repurchase of shares related to stock compensation agreements and related tax withholdings	(213)	(154)
Repayments of notes and mortgages payable		(873,642)
Repayment of borrowings under revolving credit facility		(65,000)
Borrowings under revolving credit facility		35,000
Settlement of interest rate swap liabilities		(19,425)
Loss on early extinguishment of debt		(2,715)
Net cash provided by financing activities	12,930	8,591
Net (decrease) increase in cash and cash equivalents and restricted cash	(4,846)	8,593
Cash and cash equivalents and restricted cash at beginning of period	250,425	192,339
Cash and cash equivalents and restricted cash at end of period	245,579	200,932
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH
Cash and cash equivalents at beginning of period	219,381	162,965
Restricted cash at beginning of period	31,044	29,374
Cash and cash equivalents and restricted cash at beginning of period	250,425	192,339
Cash and cash equivalents at end of period	212,547	125,734
Restricted cash at end of period	33,032	75,198
Cash and cash equivalents and restricted cash at end of period	245,579	200,932
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash payments for interest	33,170	41,375
Cash payments for income taxes, net of refunds	299	1,090
NON-CASH TRANSACTIONS:
Dividends and distributions declared but not yet paid	26,627	25,207
Additions to real estate included in accounts payable and accrued expenses	13,334	4,712
Basis adjustment to investment in unconsolidated joint ventures upon adoption of ASU 2017-05	7,086
Write-off of fully amortized and/or depreciated assets	350	2,306
Common shares issued upon redemption of common units	123	21,816
Change in fair value of interest rate swaps	$ (14,551)	$ (4,032)