CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash Flows from Operating Activities:
Net income	$ 23,174	$ 10,398
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	188,772	194,541
Straight-lining of rental revenue	(33,407)	(45,671)
Amortization of stock-based compensation expense	17,859	15,245
Amortization of above and below-market leases, net	(8,555)	(12,611)
Amortization of deferred financing costs	8,450	8,267
Receipt of accrued interest on preferred equity investment	2,339
Realized and unrealized gains on marketable securities	(2,395)	(802)
Distributions of earnings from unconsolidated joint ventures	2,852	4,910
Loss (income) from unconsolidated joint ventures	2,815	(2,931)
Distributions of earnings from unconsolidated real estate funds	1,288	232
(Income) loss from unconsolidated real estate funds	(271)	268
Real estate impairment loss		46,000
Gain on sale of real estate	(1,140)	(36,845)
Other non-cash adjustments	(153)	308
Changes in operating assets and liabilities:
Accounts and other receivables	(324)	877
Deferred charges	(16,620)	(20,637)
Other assets	25,963	(31,148)
Accounts payable and accrued expenses	(5,457)	700
Other liabilities	1,457	3,067
Net cash provided by operating activities	206,647	134,168
Cash Flows from Investing Activities:
Due from affiliates	(181,000)
Repayment of amounts due from affiliates	181,000
Proceeds from sale of real estate	150,307	349,013
Investments in and contributions of capital to unconsolidated joint ventures	(148,896)	(25,491)
Additions to real estate	(70,094)	(85,621)
Redemption of preferred equity investment	33,750
Real estate acquisition deposits	(25,000)
Sales of marketable securities	15,738	16,352
Purchases of marketable securities	(11,945)	(13,192)
Contributions of capital to unconsolidated real estate funds	(3,860)	(2,254)
Distributions of capital from unconsolidated real estate funds	1,613
Escrow deposits and loans receivable for Residential Development Fund		(15,680)
Net cash (used in) provided by investing activities	(58,387)	223,127
Cash Flows from Financing Activities:
Borrowings under revolving credit facility	195,000
Repayment of borrowings under revolving credit facility	(195,000)
Acquisition of noncontrolling interest in consolidated real estate fund	(1,000)
Repurchases of common shares	(89,005)	(3,569)
Dividends paid to common stockholders	(70,243)	(70,944)
Distributions paid to common unitholders	(7,561)	(7,514)
Distributions to noncontrolling interests	(40,037)	(10,583)
Contributions from noncontrolling interests	14,989	44,381
Proceeds from notes and mortgages payable	3,200	16,700
Repurchase of shares related to stock compensation agreements and related tax withholdings	(314)	(213)
Debt issuance costs	(260)	(6,351)
Net cash used in financing activities	(190,231)	(38,093)
Net (decrease) increase in cash and cash equivalents and restricted cash	(41,971)	319,202
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	323,438	569,627
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	298,066	538,725
Restricted cash at end of period	25,372	30,902
Cash and cash equivalents and restricted cash at end of period	323,438	569,627
Supplemental Disclosure of Cash Flow Information:
Cash payments for interest	104,616	101,989
Cash payments for income taxes, net of refunds	2,049	1,541
Non-Cash Transactions:
Change in value of interest rate swaps	28,502	(23,738)
Dividends and distributions declared but not yet paid	25,307	26,596
Common shares issued upon redemption of common units	24,006	3,461
Additions to real estate included in accounts payable and accrued expenses	13,342	32,790
Note payable issued in connection with the acquisition of noncontrolling interest in consolidated real estate fund	8,771
Write-off of fully amortized and/or depreciated assets	$ 5,292	3,141
Basis adjustment to investment in unconsolidated joint ventures upon adoption of ASU 2017-05		$ 7,086