Schedule IV - Mortgage Loans on Real Estate (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Mortgage Loans On Real Estate [Line Items]
Face Amount of Mortgages	$ 16,997,000
Carrying Amount of Mortgages	14,430,000	[1]
Principal Amount of Loans Subject to Delinquent Principal or Interest	0
Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance at beginning of year	17,482,000		22,815,000		21,138,000
New mortgage loans	3,547,000	[2]	7,344,000	[2]	8,098,000	[2]
Collections of principal	(6,599,000)		(12,339,000)		(6,421,000)
Foreclosures	0		(338,000)		0
Balance at the close of year	14,430,000		17,482,000		22,815,000
Mortgages held for federal income tax purposes	14,430,000		17,482,000		22,815,000
Payments to acquire mortgage notes receivable	3,547,000		7,344,000		8,098,000
Paramus, NJ
Mortgage Loans On Real Estate [Line Items]
Interest Rate	9.00%
Maturity Date	Feb. 01, 2022	[3]
Prior Liens	0
Face Amount of Mortgages	6,000,000
Carrying Amount of Mortgages	4,080,000
Principal Amount of Loans Subject to Delinquent Principal or Interest	0
Des Moines, IA
Mortgage Loans On Real Estate [Line Items]
Interest Rate	8.00%
Maturity Date	Nov. 15, 2014	[4]
Prior Liens	0
Face Amount of Mortgages	400,000
Carrying Amount of Mortgages	153,000
Principal Amount of Loans Subject to Delinquent Principal or Interest	0
Milford, CT
Mortgage Loans On Real Estate [Line Items]
Interest Rate	6.00%
Maturity Date	Jun. 30, 2016	[5]
Prior Liens	0
Face Amount of Mortgages	1,550,000
Carrying Amount of Mortgages	1,550,000
Principal Amount of Loans Subject to Delinquent Principal or Interest	0
Marlow Heights, MD
Mortgage Loans On Real Estate [Line Items]
Interest Rate	7.00%
Maturity Date	May 14, 2016	[5]
Prior Liens	0
Face Amount of Mortgages	750,000
Carrying Amount of Mortgages	750,000
Principal Amount of Loans Subject to Delinquent Principal or Interest	0
Montgomery, AL
Mortgage Loans On Real Estate [Line Items]
Interest Rate	8.60%
Maturity Date	Oct. 08, 2014	[6]
Prior Liens	0
Face Amount of Mortgages	2,797,000
Carrying Amount of Mortgages	2,797,000
Principal Amount of Loans Subject to Delinquent Principal or Interest	0
4 properties in FL and GA
Mortgage Loans On Real Estate [Line Items]
Interest Rate	6.75%
Maturity Date	Jun. 01, 2015	[7]
Prior Liens	0
Face Amount of Mortgages	5,500,000
Carrying Amount of Mortgages	5,100,000
Principal Amount of Loans Subject to Delinquent Principal or Interest	$ 0

[1] The following shows the changes in the carrying amounts of mortgage loans during the years: 2013 2012 2011 Balance at beginning of year$17,482 $22,815 $21,138 New mortgage loans3,547 (h) 7,344 (h) 8,098 (h) Deductions during the year: Collections of principal(6,599) (12,339) (6,421) Foreclosures— (338) — Balance at the close of year$14,430 $17,482 $22,815

[2] Mortgages totaling $3,547, $7,344 and $8,098, were accepted in connection with real estate transactions for the years ended December 31, 2013, 2012 and 2011, respectively.

[3] Principal and interest is payable at level amounts over the life of the loan.

[4] Principal and interest is payable at level amounts over the life of the loan with a principal balloon payment at maturity.

[5] Interest only payments are due monthly. Principal is due at maturity.

[6] Principal and interest is payable in full on the earlier of (i) specific events as outlined in the loan agreement, or (ii) maturity date.

[7] Interest only payments are due monthly. Periodic principal payments are due over the course of the loan based on specific terms outlined in the loan agreement, with the remaining principal balance due at maturity.