CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 64,906	$ (5,237)	$ 4,867	$ (2,301)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization			67,170	60,637
Unrealized holding gain on investments			(64,937)
Distributions of operating income from unconsolidated affiliates			2,206	5,378
Equity in earnings and gains of unconsolidated affiliates	786	(3,559)	(469)	(5,830)
Stock compensation expense			6,136	5,442
Amortization of financing costs			2,920	3,903
Impairment charge	0	1,400	51,549	1,400
Gain on disposition of properties	(485)		(485)	(2,014)
Credit loss reserves			16,175
Other, net			(2,780)	(6,979)
Changes in assets and liabilities:
Other liabilities			(6,684)	(8,499)
Prepaid expenses and other assets			(4,213)	8,583
Rents receivable			(25,177)	742
Accounts payable and accrued expenses			12,222	1,767
Net cash provided by operating activities			58,500	62,229
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisition of real estate			(21,208)	(138,716)
Development, construction and property improvement costs			(20,533)	(55,872)
(Issuance) redemption of notes receivable			(59,000)	15,250
Proceeds from the disposition of properties, net			13,925	12,252
Investments in and advances to unconsolidated affiliates and other			(3,270)	(99,592)
Return of capital from unconsolidated affiliates and other			7,151	36,423
Return (payment) of deposits for properties under contract			187	568
Payment of deferred leasing costs			(4,885)	(3,831)
Change in control of previously unconsolidated affiliate			950
Net cash used in investing activities			(86,683)	(233,518)
CASH FLOWS FROM FINANCING ACTIVITIES
Principal payments on mortgage and other notes			(14,360)	(122,492)
Principal payments on unsecured debt			(69,930)	(200,900)
Proceeds received on mortgage and other notes			3,340	131,459
Proceeds from unsecured debt			181,700	327,300
Payments of finance lease obligations			(833)	(1,500)
Repurchase of Common Shares			(22,386)
Proceeds from the sale of Common Shares, net				75,115
Capital contributions from noncontrolling interests			28,309	32,191
Distributions to noncontrolling interests			(8,178)	(8,424)
Dividends paid to Common Shareholders			(50,182)	(45,994)
Deferred financing and other costs			(960)	(4,147)
Net cash provided by financing activities			46,520	182,608
Increase in cash and restricted cash			18,337	11,319
Cash of $15,845 and $21,268 and restricted cash of $14,165 and $13,580, respectively, beginning of period			30,010	34,848	$ 34,848
Cash of $34,273 and $27,765 and restricted cash of $14,074 and $12,527, respectively, end of period	$ 48,347	$ 46,167	48,347	46,167	$ 30,010
Supplemental disclosure of cash flow information
Cash paid during the period for interest, net of capitalized interest of $4,656 and $5,326 respectively			26,558	35,385
Cash paid for income taxes, net of refunds			219	258
Supplemental disclosure of non-cash investing and financing activities
Assumption of accounts payable and accrued expenses through acquisition of real estate			116	1,796
Right-of-use assets, finance leases (removed) obtained in exchange for finance lease liabilities			(70,427)	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			31,523	57,165
Capital lease obligation exchanged for finance lease liability				71,111
Other liabilities exchanged for operating lease liabilities				946
Right of use assets, operating leases obtained (removed) in exchange for finance lease liabilities			(1,432)
Assumption of debt through investments in unconsolidated affiliates				$ 4,688
Change in control of previously unconsolidated (consolidated) investment
Increase in real estate			(135,190)
Decrease in investments in and advances to unconsolidated affiliates			96,816
Change in other assets and liabilities			1,238
Acquisition of noncontrolling interest asset			(588)
Decrease in notes receivable			38,674
Increase in cash and restricted cash upon change of control			$ 950