CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows from Operating Activities:
Net income	$ 7,000	$ 2,715
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	63,089	65,156
Straight-lining of rental revenue	(11,578)	(13,244)
Amortization of stock-based compensation expense	7,602	6,265
Amortization of above and below-market leases, net	(3,276)	(4,420)
Amortization of deferred financing costs	2,801	2,761
Receipt of accrued interest on preferred equity investment	2,339
Realized and unrealized (gains) losses on marketable securities	(1,880)	29
Loss from unconsolidated joint ventures	1,027	62
Distributions of earnings from unconsolidated real estate funds	1,011	68
Distributions of earnings from unconsolidated joint ventures	537	600
(Income) loss from unconsolidated real estate funds	(46)	66
Other non-cash adjustments	(458)	202
Changes in operating assets and liabilities:
Accounts and other receivables	(60)	46
Deferred charges	(2,570)	(4,427)
Other assets	31,000	(26,035)
Accounts payable and accrued expenses	(2,544)	5,325
Other liabilities	457	400
Net cash provided by operating activities	94,451	35,569
Cash Flows from Investing Activities:
Investments in and contributions of capital to unconsolidated joint ventures	(49,239)	(16,115)
Redemption of preferred equity investment	33,750
Additions to real estate	(27,944)	(25,413)
Receivable from affiliate	(11,000)
Purchases of marketable securities	(6,568)	(3,805)
Sales of marketable securities	3,132	7,825
Distributions of capital from unconsolidated real estate funds	1,260
Contributions of capital to unconsolidated real estate funds	(36)	(157)
Escrow deposits and loans receivable for Residential Development Fund		(15,680)
Net cash used in investing activities	(56,645)	(53,345)
Cash Flows from Financing Activities:
Distributions to noncontrolling interests	(30,777)	(1,915)
Dividends paid to common stockholders	(23,356)	(22,841)
Contributions from noncontrolling interests	14,496	29,920
Distributions paid to common unitholders	(2,546)	(2,370)
Repurchase of shares related to stock compensation agreements and related tax withholdings	(301)	(213)
Debt issuance costs	(260)	(6,351)
Proceeds from notes and mortgages payable		16,700
Net cash (used in) provided by financing activities	(42,744)	12,930
Net decrease in cash and cash equivalents and restricted cash	(4,938)	(4,846)
Cash and cash equivalents and restricted cash at beginning of period	365,409	250,425
Cash and cash equivalents and restricted cash at end of period	360,471	245,579
Reconciliation of Cash and Cash Equivalents and Restricted Cash:
Cash and cash equivalents at beginning of period	339,653	219,381
Restricted cash at beginning of period	25,756	31,044
Cash and cash equivalents and restricted cash at beginning of period	365,409	250,425
Cash and cash equivalents at end of period	342,308	212,547
Restricted cash at end of period	18,163	33,032
Cash and cash equivalents and restricted cash at end of period	360,471	245,579
Supplemental Disclosure of Cash Flow Information:
Cash payments for interest	33,872	33,170
Cash payments for income taxes, net of refunds	1,480	299
Non-Cash Transactions:
Dividends and distributions declared but not yet paid	25,949	26,627
Additions to real estate included in accounts payable and accrued expenses	15,630	13,334
Common shares issued upon redemption of common units	21,982	123
Change in value of interest rate swaps	9,026	(14,551)
Write-off of fully amortized and/or depreciated assets	$ 1,578	350
Basis adjustment to investment in unconsolidated joint ventures upon adoption of ASU 2017-05		$ 7,086