Consolidated Statements Of Income (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues:
Rental income	$ 106,029,000	$ 81,482,000	$ 72,608,000
Interest income from mortgage and other notes	7,633,000	7,426,000	6,652,000
Investment income and other	4,166,000	4,409,000	4,479,000
Revenues	117,828,000	93,317,000	83,739,000
Expenses:
Depreciation	20,101,000	14,772,000	11,450,000
Interest expense	9,229,000	3,492,000	3,848,000
Legal expense	784,000	766,000	559,000
Franchise, excise and other taxes	616,000	771,000	837,000
General and administrative	9,254,000	7,799,000	7,588,000
Loan and realty losses (recoveries), net	1,976,000	(2,195,000)	(99,000)
Total operating expenses	41,960,000	25,405,000	24,183,000
Income before equity-method investee, discontinued operations and noncontrolling interest	75,868,000	67,912,000	59,556,000
Income from equity-method investee	324,000	45,000	0
Investment and other gains	3,306,000	4,877,000	10,261,000
Income from continuing operations	79,498,000	72,834,000	69,817,000
Discontinued operations
Income from operations - discontinued	5,426,000	6,098,000	7,967,000
Gain on sale of real estate	22,258,000	11,966,000	3,348,000
Total discontinued operations	27,684,000	18,064,000	11,315,000
Net income	107,182,000	90,898,000	81,132,000
Less: net income attributable to noncontrolling interest	(999,000)	(167,000)	0
Net income attributable to common stockholders	$ 106,183,000	$ 90,731,000	$ 81,132,000
Weighted average common shares outstanding:
Basic	28,362,398	27,811,813	27,719,096
Diluted	28,397,702	27,838,720	27,792,592
Basic:
Income from continuing operations attributable to common stockholders	$ 2.77	$ 2.61	$ 2.52
Discontinued operations	$ 0.97	$ 0.65	$ 0.41
Net income per common share attributable to common stockholders	$ 3.74	$ 3.26	$ 2.93
Diluted:
Income from continuing operations attributable to common stockholders	$ 2.77	$ 2.61	$ 2.51
Discontinued operations	$ 0.97	$ 0.65	$ 0.41
Net income per common share attributable to common stockholders	$ 3.74	$ 3.26	$ 2.92