Investments In Marketable Securities (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Dividend and Interest Income From Marketable Securities	$ 822,000	$ 1,267,000	$ 1,448,000,000
Available-for-sale Securities, Gross Unrealized Gains	7,181,000	15,330,000
Marketable securities	11,364,000	22,476,000
Net realized gains and recoveries on sales of marketable securities	9,899,000		2,403,000
Cash Redemption of Liquidated Investment			8,491,000
National Healthcare Corp [Member]
Preferred Shares Sold	96,330
Net realized gains and recoveries on sales of marketable securities	151,000
LTC Properties Inc. [Member]
Common Shares Sold	381,000		100,000
Available-for-sale Securities, Common Stock Shares Held	293,800	674,800
Marketable securities	9,067,000	18,948,000
Available-for-sale Securities, Common Stock Sold, Average Price Per Share	$ 29		$ 26
Net realized gains and recoveries on sales of marketable securities	8,655,000		1,931,000
Nationwide Health Properties [Member]
Common Shares Sold	50,000
Net realized gains and recoveries on sales of marketable securities	1,090,000
Available-for-sale Securities, Common Shares Received In Exchange	39,330
Recovery of Other Than Temporary Impairment [member]
Net realized gains and recoveries on sales of marketable securities	2,735,000		1,255,000
Recovery of Other Than Temporary Impairment [member] | LTC Properties Inc. [Member]
Net realized gains and recoveries on sales of marketable securities	2,732,000		717,000
Recovery of Other Than Temporary Impairment [member] | Columbia Strategic Cash Fund [Member]
Net realized gains and recoveries on sales of marketable securities			$ 538,000