CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ (2,101)	$ 4,743	$ 84,822
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	93,110	76,596	75,408
(Gain) loss on sale of real estate, land, and other investments	(27,518)	(25,503)	(97,624)
Realized (gain) loss on marketable securities	0	3,378	0
(Gain) loss on extinguishment of debt and discontinued operations	535	23	2,360
(Gain) loss on litigation settlement	0	0	(1,349)
Share-based compensation expense	2,687	2,106	1,905
(Gain) loss on interest rate swap termination, amortization, and mark-to-market	4,931	0	0
Bad debt expense	2,304	2,332	1,050
Other, net	(268)	1,310	46
Changes in other assets and liabilities:
Other assets	(5,402)	(4,818)	1,076
Accounts payable and accrued expenses	15,750	1,061	1,930
Net cash provided (used) by operating activities	84,028	61,228	69,624
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from repayment of mortgage loans receivable	0	10,020	0
Proceeds from sale of marketable securities	0	3,856	0
Increase in mortgages and notes receivable	(18,614)	(24,862)	(6,279)
Purchase of marketable securities	0	(179)	(6,942)
Proceeds from sale of real estate and other investments	61,334	43,686	199,282
Payments for acquisitions of real estate assets	(273,566)	(168,696)	(158,466)
Payments for improvements of real estate assets	(35,877)	(30,315)	(20,954)
Other investing activities	(502)	1,525	366
Net cash provided (used) by investing activities	(267,225)	(164,965)	7,007
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from mortgages payable	196,725	0	59,900
Principal payments on mortgages payable	(36,282)	(33,422)	(177,743)
Proceeds from revolving lines of credit	258,580	155,028	245,397
Principal payments on revolving lines of credit	(335,451)	(52,235)	(252,818)
Proceeds from notes payable and other debt	174,544	0	124,878
Principal payments on notes payable and other debt	(145,000)	0	0
Payments for termination of interest rate swaps	(3,804)	0	0
Proceeds from sale of common shares, net of issuance costs	156,038	58,852	22,019
Payments for acquisition of noncontrolling interests – consolidated real estate entities	0	(12,221)	(1,260)
Repurchase of common shares	0	0	(18,023)
Repurchase of preferred shares	0	(5,629)	0
Repurchase of partnership units	0	(50)	(8,147)
Distributions paid to common shareholders	(38,487)	(35,045)	(32,891)
Distributions paid to preferred shareholders	(6,428)	(6,528)	(6,821)
Distributions paid to noncontrolling interests – Operating Partnership and Series E preferred units	(4,916)	(2,900)	(3,630)
Distributions paid to preferred unitholders	(640)	(640)	(377)
Other financing activities	(367)	(280)	(254)
Net cash provided (used) by financing activities	214,512	64,930	(49,770)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	31,315	(38,807)	26,861
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF YEAR	7,310	46,117	19,256
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF YEAR	38,625	7,310	46,117
SUPPLEMENTARY SCHEDULE OF NON-CASH INVESTING AND FINANCING ACTIVITIES
Accrued capital expenditures	(802)	(1,420)	1,273
Operating partnership units converted to shares	(4,714)	(1,750)	7,823
Distributions declared but not paid	11,411	9,802	9,210
Retirement of shares withheld for taxes	933	0	0
Real estate assets acquired through assumption of debt	20,000	0	0
Fair value adjustment to debt	2,367	0	0
Property acquired through issuance of Series D preferred units	0	0	16,560
Real estate assets acquired through exchange of note receivable	0	17,663	0
Note receivable exchanged through real estate acquisition	0	(17,663)	0
Real estate acquired through issuance of Series E preferred units	217,513	0	0
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for interest	26,528	26,051	28,679
Cash and cash equivalents	31,267	392	26,579
Restricted cash	7,358	6,918	19,538
Total cash, cash equivalents and restricted cash	$ 38,625	$ 7,310	$ 46,117