Condensed Consolidated Statements Of Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenues:
Operating Leases, Income Statement, Lease Revenue	$ 21,307	$ 18,929
Mortgage interest income	1,702	1,596
Investment income and other	1,060	1,412
Net Revenues	24,069	21,937
Expenses:
Depreciation, Continuing Operations	3,365	2,868
Interest expense (Note 7)	575	(741)
Legal expense	91	188
Franchise, excise and other taxes	125	287
General and administrative	2,786	3,845
Total operating expenses	6,942	6,447
Income from continuing operations	17,127	15,490
Discontinued operations
Income from operations - discontinued	1,223	1,304
Gain on sale of real estate	0	2,299
Income from discontinued operations	1,223	3,603
Net income	18,350	19,093
Unrealized holding gain arising during the period	408	549
Less: reclassification adjustment for gains included in net income	0	(154)
Net gain recognized in other comprehensive income	408	395
Total comprehensive income	$ 18,758	$ 19,488
Earnings Per Share, Basic, Other Disclosures [Abstract]
Weighted Average Number of Shares Outstanding, Basic	27,776,104	27,696,727
Weighted Average Number of Shares Outstanding, Diluted	27,803,222	27,796,109
Earnings per common share, Basic:
Income from continuing operations	$ 0.62	$ 0.56
Discontinued operations	$ 0.04	$ 0.13
Net income per common share	$ 0.66	$ 0.69
Earnings per common share, Diluted:
Income from continuing operations	$ 0.62	$ 0.56
Discontinued operations	$ 0.04	$ 0.13
Net income per common share	$ 0.66	$ 0.69