Condensed Consolidated Statements Of Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues:
Operating Leases, Income Statement, Lease Revenue	$ 22,285,000	$ 19,975,000	$ 64,905,000	$ 59,868,000
Mortgage interest income	1,879,000	1,689,000	5,428,000	4,919,000
Investment income and other	1,348,000	1,107,000	3,462,000	3,499,000
Net Revenues	25,512,000	22,771,000	73,795,000	68,286,000
Expenses:
Depreciation, Continuing Operations	5,892,000	2,930,000	12,653,000	8,729,000
Interest expense (Note 7)	854,000	1,781,000	2,176,000	2,628,000
Legal expense	205,000	119,000	424,000	448,000
Franchise, excise and other taxes	271,000	160,000	626,000	642,000
General and administrative	1,639,000	1,234,000	6,018,000	6,371,000
Loan and realty losses (recoveries)	2,300,000	(99,000)	2,300,000	(99,000)
Total operating expenses	11,161,000	6,125,000	24,197,000	18,719,000
Income before unconsolidated entity, gains on sales of marketable	14,351,000	16,646,000	49,598,000	49,567,000
Income from unconsolidated entity	0	0	0	0
Gains on sales of marketable securities	0	1,090,000	30,000	9,899,000
Income from continuing operations	14,351,000	17,736,000	49,628,000	59,466,000
Discontinued operations
Income from operations - discontinued	0	24,000	0	204,000
Gain on sale of real estate	0	1,048,000	0	3,348,000
Income from discontinued operations	0	1,072,000	0	3,552,000
Net income	14,351,000	18,808,000	49,628,000	63,018,000
Net income attributable to noncontrolling interest	0	0	0	0
Net income attributable to common stockholders	14,351,000	18,808,000	49,628,000	63,018,000
Unrealized holding gain arising during the period	(1,336,000)	(862,000)	567,000	(104,000)
Less: reclassification adjustment for gains included in net income	0	(1,090,000)	(30,000)	(9,899,000)
Decrease in fair value of cash flow hedge	(436,000)	0	(1,343,000)	0
Net gain recognized in other comprehensive income	(1,772,000)	(1,952,000)	(806,000)	(10,003,000)
Total comprehensive income	$ 12,579,000	$ 16,856,000	$ 48,822,000	$ 53,015,000
Earnings Per Share, Basic, Other Disclosures [Abstract]
Weighted Average Number of Shares Outstanding, Basic	27,830,311	27,729,560	27,799,750	27,711,474
Weighted Average Number of Shares Outstanding, Diluted	27,862,582	27,789,725	27,828,879	27,795,150
Earnings per common share, Basic:
Income from continuing operations	$ 0.52	$ 0.64	$ 1.78	$ 2.14
Discontinued operations	$ 0.00	$ 0.04	$ 0.00	$ 0.13
Net income per common share	$ 0.52	$ 0.68	$ 1.78	$ 2.27
Earnings per common share, Diluted:
Income from continuing operations	$ 0.52	$ 0.64	$ 1.78	$ 2.14
Discontinued operations	$ 0.00	$ 0.04	$ 0.00	$ 0.13
Net income per common share	$ 0.52	$ 0.68	$ 1.78	$ 2.27