Condensed Consolidated Statements Of Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenues:
Operating Leases, Income Statement, Lease Revenue	$ 18,843	$ 18,565	$ 40,150	$ 37,494
Mortgage interest income	1,847	1,634	3,549	3,230
Investment income and other	1,084	9,790	2,144	11,202
Net Revenues	21,774	29,989	45,843	51,926
Expenses:
Depreciation, Continuing Operations	3,396	2,930	6,761	5,798
Interest expense (Note 7)	747	1,589	1,321	848
Legal expense	128	141	220	329
Franchise, excise and other taxes	229	194	354	482
General and administrative	1,593	1,293	4,379	5,137
Total operating expenses	6,093	6,147	13,035	12,594
Income from continuing operations	15,681	23,842	32,808	39,332
Discontinued operations
Income from operations - discontinued	1,247	1,275	2,470	2,579
Gain on sale of real estate	0	0	0	2,299
Income from discontinued operations	1,247	1,275	2,470	4,878
Net income	16,928	25,117	35,278	44,210
Unrealized holding gain arising during the period	1,494	209	1,903	758
Less: reclassification adjustment for gains included in net income	(30)	(8,655)	(30)	(8,809)
Decrease in fair value of cash flow hedge	(907)	0	(907)	0
Net gain recognized in other comprehensive income	557	(8,446)	966	(8,051)
Total comprehensive income	$ 17,485	$ 16,671	$ 36,244	$ 36,159
Earnings Per Share, Basic, Other Disclosures [Abstract]
Weighted Average Number of Shares Outstanding, Basic	27,792,834	27,708,136	27,784,469	27,702,432
Weighted Average Number of Shares Outstanding, Diluted	27,820,831	27,799,616	27,812,027	27,797,863
Earnings per common share, Basic:
Income from continuing operations	$ 0.56	$ 0.86	$ 1.18	$ 1.42
Discontinued operations	$ 0.05	$ 0.04	$ 0.09	$ 0.17
Net income per common share	$ 0.61	$ 0.90	$ 1.27	$ 1.59
Earnings per common share, Diluted:
Income from continuing operations	$ 0.56	$ 0.86	$ 1.18	$ 1.42
Discontinued operations	$ 0.05	$ 0.04	$ 0.09	$ 0.17
Net income per common share	$ 0.61	$ 0.90	$ 1.27	$ 1.59