Consolidated Statements Of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net income	$ 111,967,000	$ 185,311,000	$ 160,449,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	80,798,000	83,150,000	76,816,000
Amortization	4,354,000	5,392,000	5,117,000
Amortization of commitment fees and note receivable discounts	(729,000)	(867,000)	(493,000)
Amortization of lease inducement	1,026,000	987,000	845,000
Straight-line rental income	(14,603,000)	(20,411,000)	(22,084,000)
Non-cash interest income on construction loan	(2,614,000)	(3,839,000)	(2,204,000)
Gain on sale of real estate	(32,498,000)	(21,316,000)	0
Loss on extinguishment of debt	1,912,000	3,924,000	823,000
Income (Loss) from Equity Method Investments	1,545,000	3,126,000	0
Loan and realty losses (recoveries), net	(52,766,000)	(991,000)	(2,440,000)
Payment of lease incentives	(1,042,000)	(623,000)	(3,100,000)
Share-based compensation	8,415,000	3,061,000	3,646,000
Change in operating assets and liabilities:
Equity-method investment and other assets	(4,050,000)	160,000	1,604,000
Accounts payable and accrued expenses	3,352,000	(6,681,000)	300,000
Deferred income	260,000	(217,000)	16,796,000
Net cash provided by operating activities	210,859,000	232,148,000	240,955,000
Cash flows from investing activities:
Investment in mortgage and other notes receivable	(72,236,000)	(58,356,000)	(108,232,000)
Collection of mortgage and other notes receivable	67,790,000	46,612,000	2,897,000
Investment in real estate	(46,817,000)	(102,712,000)	(219,187,000)
Proceeds from disposition of real estate properties	238,864,000	39,631,000	0
Investment in renovations of existing real estate	(3,465,000)	(13,854,000)	(17,999,000)
Investment in real estate development	(64,000)	(158,000)	0
Payments to Acquire Equity Method Investments	0	(875,000)	0
Proceeds from Equity Method Investment, Distribution	1,205,000	0	0
Net cash used in investing activities	(185,277,000)	89,712,000	342,521,000
Cash flows from financing activities:
Payments on revolving credit facility	95,000,000	205,000,000	397,000,000
Payments on revolving credit facility	(393,000,000)	(207,000,000)	(181,000,000)
Borrowings on term loan	0	100,000,000	0
Payments of term loans	(293,316,000)	(43,729,000)	(1,187,000)
Proceeds from Issuance of Senior Long-term Debt	396,784,000	0	0
Payment for Debt Extinguishment or Debt Prepayment Cost	(1,462,000)	(1,619,000)	0
Debt issuance costs	(5,018,000)	(1,039,000)	(126,000)
Distributions to noncontrolling interest	(910,000)	(748,000)	(15,000)
Proceeds for noncontrolling interest	0	13,000	643,000
Taxes remitted in relation to employee stock options exercised	0	(2,705,000)	(1,559,000)
Proceeds from equity offering, net	47,904,000	34,649,000	95,774,000
Convertible bond redemption	(66,076,000)	0	(22,468,000)
Dividends paid to stockholders	(182,900,000)	(194,584,000)	(179,739,000)
Net cash provided by (used in) financing activities	(402,994,000)	(111,762,000)	107,323,000
Increase (decrease) in cash and cash equivalents	(6,858,000)	30,674,000	5,757,000
Cash and cash equivalents and restricted cash, beginning of period	46,343,000	15,669,000	9,912,000
Cash and cash equivalents and restricted cash, end of period	39,485,000	46,343,000	15,669,000
Supplemental disclosure of cash flow information:
Interest paid, net of amounts capitalized	43,680,000	43,406,000	54,027,000
Supplemental schedule of non-cash investing and financing activities:
Change in straight-line rent receivable related to investments in real estate	0	0	38,000,000
Reclass of note balance into real estate investment	0	63,220,000	14,000,000
Noncontrolling Interest, Noncash Increase from Subsidiary Equity Issuance	0	10,778,000	0
Increase in mortgage note receivable from sale of real estate	0	4,000,000	0
Change in other assets related to investments in real estate	0	348,000	291,000
Noncash or Part Noncash Acquisition, Other Assets Acquired	(33,000)
Change in accounts payable related to investments in real estate construction	(62,000)	0	(1,082,000)
Change in accounts payable related to investments in real estate acquisition	0	0	2,911,000
Change in Accounts Payable, Renovations of existing real estate	0	784,000	0
Change in accounts payable related to distributions to noncontrolling interests	$ 64,000	$ 138,000	$ 0