Fair Value Disclosures (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended			6 Months Ended				6 Months Ended					3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Jun. 30, 2012 Fixed Rate Mortgage Notes Receivable [Member]	Jun. 30, 2012 Fixed Rate Notes Receivable [Member]	Jun. 30, 2012 Variable Rate Debt [Member]	Jun. 30, 2012 Variable Rate Converted to Fixed Rate [Member]	Jun. 30, 2012 Fixed Rate Debt [Member]	Jun. 30, 2012 Fair Value, Measurements, Nonrecurring [Member]	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member]	Mar. 31, 2012 Fair Value, Inputs, Level 3 [Member]	Jun. 30, 2012 Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Nonrecurring [Member]	Mar. 31, 2012 Vineyard And Winery Facility Member	Jun. 30, 2012 Vineyard And Winery Facility Member
Rental properties, net											$ 43,233,000		$ 47,100,000	$ 43,233,000
Asset impairment charges relating to winery and vineyard properties	0	24,298,000	8,195,000	24,298,000							12,000,000	800,000			12,800,000	12,800,000
Mortgage notes and related accrued interest receivable, net	403,619,000		403,619,000		325,097,000	403,600,000
Weighted average interest rate of mortgage notes receivable						8.80%
Receivable interest rate minimum						7.00%	6.00%
Receivable interest rate maximum						10.65%	15.00%
Weighted market rate used for determining future cash flow for notes receivable						10.06%
Fair value of notes receivable						378,700,000	4,900,000
Investments in direct financing leases, net	236,157,000		236,157,000		233,619,000
Finance lease investment weighted average interest rate			12.02%
Minimum interest on investments in direct finance lease			11.93%
Maximum interest on investments in direct finance lease			12.38%
Notes receivable and related accrued interest receivable, net	5,007,000		5,007,000		5,015,000		5,000,000
Weighted average interest rate of note receivable							8.45%
Estimated market rate used for determining discounted cash flow for fixed rate notes							9.40%
Long-term debt	1,270,560,000		1,270,560,000		1,154,295,000			362,600,000	240,000,000	907,900,000
Long-term debt, weighted average interest rate								1.89%		6.56%
Weighted market rate for determining fair value of debt										4.64%
Fair value of debt										$ 961,600,000