Real Estate Investments (Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas) (Details)	6 Months Ended
	Jun. 30, 2012
Michigan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Annualized Rental Income, Percentage	16.20%
South Carolina [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Annualized Rental Income, Percentage	14.20%
IOWA
Revenues from External Customers and Long-Lived Assets [Line Items]
Annualized Rental Income, Percentage	13.40%
New York [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Annualized Rental Income, Percentage	11.90%
Ohio [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Annualized Rental Income, Percentage	11.00%