CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	$ (2,270)	$ 6,108	$ (6,430)	$ 26,079
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Gain on disposition of properties			(33)	0
Depreciation and amortization			58,079	50,593
Distributions of operating income from unconsolidated affiliates			10,210	10,301
Equity in earnings and gains of unconsolidated affiliates			(6,703)	(17,043)
Stock compensation expense			6,113	7,002
Amortization of financing costs			2,743	2,504
Other, net			(4,450)	(7,625)
Changes in assets and liabilities:
Other liabilities			680	(820)
Prepaid expenses and other assets			(1,883)	(3,417)
Rents receivable, net			(4,252)	(3,837)
Accounts payable and accrued expenses			(5,038)	5,164
Net cash provided by operating activities			49,036	68,901
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisition of real estate			(46,171)	(77,785)
Development, construction and property improvement costs			(41,937)	(46,303)
Issuance of or advances on notes receivable			(3,002)	(10,300)
Proceeds from the disposition of properties, net			25,218	0
Investments in and advances to unconsolidated affiliates			(2,265)	(4,262)
Return of capital from unconsolidated affiliates and other			19,512	28,409
Proceeds from notes receivable			26,000	12,000
Return (payment) of deposits for properties under contract			1,750	(1,000)
Payment of deferred leasing costs			(1,645)	(3,894)
Net cash used in investing activities			(22,540)	(103,135)
CASH FLOWS FROM FINANCING ACTIVITIES
Principal payments on mortgage and other notes			(48,272)	(31,901)
Principal payments on unsecured debt			(519,300)	(130,716)
Proceeds received on mortgage and other notes			119,752	98,528
Proceeds from unsecured debt			482,300	119,400
Payments for repurchase of Common Shares			(55,057)	0
Capital contributions from noncontrolling interests			6,550	20,505
Distributions to noncontrolling interests			(19,004)	(8,452)
Dividends paid to Common Shareholders			(44,863)	(56,019)
Deferred financing and other costs			(3,185)	(4,067)
Net cash (used in) provided by financing activities			(81,079)	7,278
Decrease in cash and restricted cash			(54,583)	(26,956)
Cash of $74,823 and $71,805 and restricted cash of $10,846 and $22,904, respectively, beginning of period			85,669	94,709	$ 94,709
Cash of $17,330 and $43,442 and restricted cash of $13,756 and $24,311, respectively, end of period	$ 31,086	$ 67,753	31,086	67,753	$ 85,669
Supplemental disclosure of cash flow information
Cash paid during the period for interest, net of capitalized interest of $2,836 and $9,666, respectively			29,219	23,343
Cash paid for income taxes, net of (refunds)			0	138
Supplemental disclosure of non-cash investing activities
Assumption of accounts payable and accrued expenses through acquisition of real estate			425	1,927
Acquisition of real estate through conversion of note receivable			0	9,142
Acquisition of undivided interest in a property through conversion of notes receivable			$ 22,201	$ 16,005