CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 21,204	$ (15,698)	$ 64,308
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	125,443	117,549	104,934
Distributions of operating income from unconsolidated affiliates	11,273	15,556	15,556
Equity in earnings and gains of unconsolidated affiliates	(8,922)	(9,302)	(23,371)
Stock compensation expense	10,957	12,948	11,155
Amortization of financing costs	7,577	6,008	5,985
Impairment charge	1,721		14,455
Gain on disposition of properties	(30,324)	(5,140)	(48,886)
Gain on change in control			(5,571)
Deferred gain on tax credits	(5,034)
Other, net	(11,627)	(11,768)	(10,621)
Changes in assets and liabilities:
Other liabilities	(4,466)	6,161	(4,285)
Prepaid expenses and other assets	8,198	(7,168)	(6,498)
Rents receivable, net	(455)	(10,044)	(11,274)
Accounts payable and accrued expenses	1,632	(3,026)	8,768
Net cash provided by operating activities	127,177	96,076	114,655
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisition of real estate	(319,673)	(147,985)	(200,429)
Acquisition of leasehold interests	(39,031)
Development, construction and property improvement costs	(89,270)	(94,834)	(108,142)
Issuance of or advances on notes receivable	(3,608)	(3,002)	(10,600)
Proceeds from the disposition of properties, net	88,738	63,866	260,711
Investments in and advances to unconsolidated affiliates and other	(151,281)	(3,161)	(6,535)
Return of capital from unconsolidated affiliates and other	105,999	26,338	43,684
Proceeds from notes receivable	15,250	26,000	32,000
Return of deposits for properties under contract	2,870	1,692	(2,000)
Payment of deferred leasing costs	(7,051)	(6,106)	(5,202)
Change in control of previously unconsolidated affiliate		573	576
Net cash (used in) provided by investing activities	(397,057)	(136,619)	4,063
CASH FLOWS FROM FINANCING ACTIVITIES
Principal payments on mortgage and other notes	(168,211)	(81,726)	(306,119)
Principal payments on unsecured debt	(521,600)	(632,300)	(277,134)
Proceeds received on mortgage and other notes	326,268	187,173	156,344
Proceeds from unsecured debt	526,400	648,800	359,625
Payments of finance lease obligations	(2,749)
Repurchase of Common Shares		(55,111)
Proceeds from the sale of Common Shares, net	145,498
Capital contributions from noncontrolling interests	161,628	47,560	85,206
Distributions to noncontrolling interests	(101,370)	(31,568)	(39,942)
Dividends paid to Common Shareholders	(93,902)	(88,887)	(99,527)
Deferred financing and other costs	(6,920)	(4,219)	(6,211)
Net cash provided by (used in) financing activities	265,042	(10,278)	(127,758)
Decrease in cash and restricted cash	(4,838)	(50,821)	(9,040)
Cash of $21,268, $74,823 and $71,805 and restricted cash of $13,580, $10,846 and $22,904, respectively, beginning of year	34,848	85,669	94,709
Cash of $15,845, $21,268 and $74,823 and restricted cash of $14,165, $13,580 and $10,846, respectively, end of year	30,010	34,848	85,669
Supplemental disclosure of cash flow information
Cash paid during the period for interest, net of capitalized interest of $12,586 and $5,625 and $13,509 respectively	53,586	61,832	49,942
Cash paid for income taxes, net of refunds	730	1,227	875
Supplemental disclosure of non-cash investing activities
Assumption of accounts payable and accrued expenses through acquisition of real estate	4,666	2,597	2,173
Right-of-use assets, finance leases obtained in exchange for finance lease liabilities	16,349
Right-of-use assets, finance leases obtained in exchange for assets under capital lease	76,965
Right-of-use assets, operating leases obtained in exchange for operating lease liabilities	57,165
Capital lease obligation exchanged for finance lease liability	71,111
Note receivable exchanged for sale of real estate	13,530
Other liabilities exchanged for operating lease liabilities	946
Assumption of debt through investments in unconsolidated affiliates	4,688
Acquisition of undivided interest in a property through conversion of notes receivable		22,201	60,695
Acquisition of real estate through conversion of note receivable			9,142
Change in control of previously unconsolidated (consolidated) investment
(Increase) decrease in real estate	828	(31,836)	(39,322)
Decrease (increase) in investments in and advances to unconsolidated affiliates	(1,189)	35,881	4,159
Change in other assets and liabilities	12	(3,472)	(1,842)
Decrease in right-of-use assets, finance leases	11,051
Decrease in finance lease liability	$ (10,702)
Decrease in notes receivable			32,010
Gain on change in control			5,571
Increase in cash and restricted cash upon change of control		$ 573	$ 576