CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash Flows from Operating Activities:
Net income (loss)	$ 12,174	$ (33,863)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	125,714	129,931
Straight-lining of rental revenue	(22,110)	(29,983)
Amortization of stock-based compensation expense	12,685	10,915
Amortization of above and below-market leases, net	(6,003)	(8,724)
Amortization of deferred financing costs	5,626	5,515
Receipt of accrued interest on preferred equity investment	2,339
Realized and unrealized (gains) losses on marketable securities	(2,474)	1
Distributions of earnings from unconsolidated joint ventures	1,980	1,170
Loss (income) from unconsolidated joint ventures	1,483	(2,459)
Distributions of earnings from unconsolidated real estate funds	1,137	135
(Income) loss from unconsolidated real estate funds	(65)	80
Real estate impairment loss		46,000
Other non-cash adjustments	(339)	40
Changes in operating assets and liabilities:
Accounts and other receivables	381	1,533
Deferred charges	(8,466)	(13,734)
Other assets	(6,294)	(1,910)
Accounts payable and accrued expenses	(12,293)	1,297
Other liabilities	1,338	567
Net cash provided by operating activities	106,813	106,511
Cash Flows from Investing Activities:
Due from affiliates	(181,000)
Repayment of amounts due from affiliates	11,000
Investments in and contributions of capital to unconsolidated joint ventures	(52,525)	(17,137)
Additions to real estate	(50,766)	(51,610)
Redemption of preferred equity investment	33,750
Real estate acquisition deposits	(20,000)
Sales of marketable securities	10,407	15,253
Purchases of marketable securities	(8,867)	(12,140)
Distributions of capital from unconsolidated real estate funds	1,260
Contributions of capital to unconsolidated real estate funds	(243)	(2,254)
Escrow deposits and loans receivable for Residential Development Fund		(15,680)
Distributions of capital from unconsolidated joint ventures		2,608
Net cash used in investing activities	(256,984)	(80,960)
Cash Flows from Financing Activities:
Borrowings under revolving credit facility	170,000
Dividends paid to common stockholders	(46,804)	(46,892)
Distributions paid to common unitholders	(5,047)	(4,945)
Distributions to noncontrolling interests	(34,919)	(4,118)
Contributions from noncontrolling interests	14,966	36,128
Repurchases of common shares	(6,488)
Repurchase of shares related to stock compensation agreements and related tax withholdings	(307)	(213)
Debt issuance costs	(260)	(6,351)
Proceeds from notes and mortgages payable		16,700
Net cash provided by (used in) financing activities	91,141	(9,691)
Net (decrease) increase in cash and cash equivalents and restricted cash	(59,030)	15,860
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	306,379	266,285
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	283,485	233,530
Restricted cash at end of period	22,894	32,755
Cash and cash equivalents and restricted cash at end of period	306,379	266,285
Supplemental Disclosure of Cash Flow Information:
Cash payments for interest	69,401	67,367
Cash payments for income taxes, net of refunds	2,053	1,699
Non-Cash Transactions:
Dividends and distributions declared but not yet paid	25,953	26,621
Change in value of interest rate swaps	24,371	20,346
Common shares issued upon redemption of common units	23,990	469
Additions to real estate included in accounts payable and accrued expenses	18,370	10,400
Write-off of fully amortized and/or depreciated assets	$ 3,387	2,947
Basis adjustment to investment in unconsolidated joint ventures upon adoption of ASU 2017-05		$ 7,086