Consolidated Statements Of Income - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues:
Rental income	$ 307,208,000	$ 294,182,000	$ 280,813,000
Interest income from mortgage and other notes	25,603,000	23,899,000	13,799,000
Revenues	332,811,000	318,081,000	294,612,000
Expenses:
Depreciation	83,150,000	76,816,000	71,349,000
Interest expense	52,882,000	56,299,000	49,055,000
Legal expense	1,252,000	507,000	309,000
Franchise, excise and other taxes	534,000	1,550,000	1,166,000
General and administrative	13,304,000	13,399,000	12,547,000
Property taxes and insurance on leased properties	9,653,000	5,798,000	0
Loan and realty losses (recoveries), net	991,000	2,440,000	5,115,000
Total operating expenses	161,766,000	156,809,000	139,541,000
Loss on convertible note retirement	3,924,000	823,000	738,000
Income (Loss) from Equity Method Investments	(3,126,000)	0	0
Gain on sale of real estate	21,316,000	0	0
Net income	185,311,000	160,449,000	154,333,000
Less: net income attributable to noncontrolling interest	185,000	(7,000)	0
Net income attributable to common stockholders	$ 185,126,000	$ 160,456,000	$ 154,333,000
Weighted average common shares outstanding:
Basic	44,696,285	43,417,828	41,943,873
Diluted	44,698,004	43,703,248	42,091,731
Basic:
Net income per common share attributable to common stockholders	$ 4.14	$ 3.70	$ 3.68
Diluted:
Net income per common share attributable to common stockholders	$ 4.14	$ 3.67	$ 3.67