Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating activities:
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 20,532,000	$ (181,603,000)	$ (7,458,000)
Reconciliation of net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	169,193,000	201,677,000	185,065,000
Amortization of above and below Market Leases	(5,706,000)	(8,021,000)	(5,765,000)
Deferred fee income amortization	(5,660,000)	(5,059,000)	(6,274,000)
amortization of purchase option termination fee income	(9,712,000)	(6,536,000)	(9,111,000)
Deferred Sales Inducement Cost, Amortization Expense	5,914,000	4,267,000	3,220,000
Deferred loan cost amortization	6,461,000	6,855,000	6,450,000
deferred interest income	(9,769,000)	(12,372,000)	(13,828,000)
Share-based Compensation	15,258,000	14,391,000	8,063,000
Gains (Losses) on Sales of Investment Real Estate	(21,109,000)	(23,456,000)	0
Proceeds from Sale of Land Held-for-use	(12,000)	517,000	2,521,000
Gain (Loss) From Unconsolidated Joint Ventures	665,000	314,000	0
cash inflows purchase option terminations	12,489,000	7,000,000	3,591,000
Gain (Loss) on Extinguishment of Debt	0	6,674,000	84,000
Non-Cash Settlement Of Related Party Line Of Credit From Internalizations	0	20,864,000	0
noncash loan interest income	0	0	(637,000)
cash inflows mortgage interest from consolidated VIE	0	0	18,750,000
mortgage interes cash outflows consolidated VIE	0	0	(18,750,000)
Provision for Loan and Lease Losses	672,000	6,103,000	2,038,000
Changes in operating assets and liabilities:
(Increase) in tenant accounts receivable	(5,432,000)	(24,819,000)	(21,209,000)
(Increase) decrease in other assets	3,208,000	7,084,000	1,518,000
Increase (Decrease) in Deferred Liabilities	0	22,851,000	0
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	0	15,000,000	0
Increase in accounts payable and accrued expenses	5,026,000	(2,805,000)	2,405,000
Net cash provided by (used in) operating activities	182,042,000	47,892,000	145,631,000
Investing activities:
Investments in real estate loans	(66,562,000)	(58,519,000)	(97,636,000)
Proceeds from Principal Repayments on Loans and Leases Held-for-investment	140,094,000	115,726,000	54,384,000
Deferred real estate loan income	1,863,000	15,249,000	(2,602,000)
Deferred acquisition fee on real estate loans	0	(5,078,000)	(5,219,000)
Proceeds from Sale of Loans Receivable	12,706,000	3,898,000	747,000
Mortgage principal received via consolidated VIE	0	0	6,570,000
Payments to Acquire Mortgage-backed Securities (MBS), Available-for-sale	0	0	(30,841,000)
Proceeds from Sale of Mortgage-backed Securities (MBS), Available-for-sale	0	0	79,558,000
Payments to Acquire Real Estate	(335,252,000)	(322,027,000)	(619,236,000)
Acquisition of properties, net	354,241,000	516,264,000	643,000
Proceeds from Sale of Real Estate Held-for-investment	(2,742,000)	(50,000)	(100,000)
proceeds from sale of interest in joint venture	(30,313,000)	(52,809,000)	(48,071,000)
return of capital from joint venture	0	19,221,000	0
Receipt of insurance proceeds for capital improvements	0	12,250,000	0
Proceeds from Sale of Productive Assets	0	0	746,000
Net cash (used in) investing activities	74,035,000	244,125,000	(661,057,000)
Financing activities:
Proceeds from mortgage notes payable	309,839,000	469,184,000	405,430,000
Extinguishment of Debt, Amount	(113,083,000)	(438,308,000)	(176,903,000)
Payments for mortgage loan costs	(5,859,000)	(12,140,000)	(8,705,000)
Payment for Debt Extinguishment or Debt Prepayment Cost	0	(5,733,000)	0
Payments to real estate loan participants	0	0	(5,223,000)
Proceeds from non-revolving lines of credit	293,000,000	442,000,000	265,200,000
Payments on revolving lines of credit	(315,000,000)	(420,000,000)	(322,200,000)
Proceeds from Short-term Debt	0
Repayments of Short-term Debt		(70,000,000)	70,000,000
Mortgage principal paid to other participants of consolidated VIEs	0	0	(6,570,000)
Proceeds from Securities Purchased under Agreements to Resell	0	0	4,857,000
Payments to Acquire Available-for-sale Securities	0	0	(4,857,000)
Proceeds from Issuance of Preferred Stock and Preference Stock	110,991,000	206,381,000	501,076,000
Proceeds from Issuance of Common Stock	28,154,000	4,546,000	11,659,000
Preferred Stock, Redemption Amount	(379,997,000)	(314,154,000)	(12,124,000)
Dividends declared and paid	(36,282,000)	(42,100,000)	(45,439,000)
Payments of Ordinary Dividends, Preferred Stock and Preference Stock	(154,904,000)	(161,746,000)	(111,738,000)
Payments for deferred offering costs, net of non cash items	(3,557,000)	(11,509,000)	(4,013,000)
Payments of Ordinary Dividends, Noncontrolling Interest	(2,215,000)	(161,000)	0
Proceeds from Noncontrolling Interests	0	186,000	4,539,000
Net Cash Provided by (Used in) Financing Activities	(268,913,000)	(353,554,000)	564,989,000
Cash and Cash Equivalents, Period Increase (Decrease)	(12,836,000)	(61,537,000)	49,563,000
Cash beginning of period	75,716,000	137,253,000	87,690,000
Cash end of period	62,880,000	75,716,000	137,253,000
Noncash Investing and Financing Items [Abstract]
Cash paid for interest	96,118,000	111,076,000	103,298,000
Accrued capital expenditures	4,766,000	5,189,000	4,816,000
receivable for deferred offering costs	3,643,000	2,724,000	261,000
Writeoff of fully amortized deferred loan costs	4,068,000	2,828,000	1,919,000
Variable Interest Entity, Consolidated, Assets, Noncurrent, Pledged	0	0	270,669,000
Variable Interest Entity, Consolidated, Liabilities, Noncurrent	0	0	270,670,000
deconsolidation of VIE assets	0	0	578,707,000
deconsolidation of VIE liabilities	0	0	578,707,000
Accrued and payable deferred offering costs	0	98,000	3,836,000
Reclass of offering costs from deferred asset to equity	6,107,000	4,671,000	12,551,000
loan receivables converted to equity for property acquisition	0	0	47,797,000
Share-based Compensation	6,686,000	6,461,000	719,000
Loans Assumed	0	0	41,550,000
mortgage debt refinanced	78,181,000	86,669,000	65,607,000
Proceeds from Delayed Tax Exempt Exchange	0	15,912,000	0
Noncash Extinguishment Of notes Receivable	0	20,865,000	0
Non-Cash Contribution of Property into an Unconsolidated Joint Venture	0	38,443,000	0
Noncash or Part Noncash Acquisition, Debt Assumed	454,808,000	0	0
Common Stock [Member]
Noncash Investing and Financing Items [Abstract]
Dividends payable	9,785,000	8,924,000	12,156,000
Series A Preferred Stock [Member]
Financing activities:
Proceeds from Issuance of Preferred Stock and Preference Stock	(122,108,000)	(227,630,000)	(548,638,000)
Noncash Investing and Financing Items [Abstract]
Dividends payable	10,127,000	11,213,000	11,363,000
Parent [Member]
Operating activities:
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	20,446,000	(177,788,000)	(7,244,000)
Parent [Member] | Series A Preferred Stock [Member]
Financing activities:
Proceeds from Issuance of Preferred Stock and Preference Stock	$ (122,108,000)	$ (227,630,000)	$ (548,638,000)