Rental Income (Details Textual)	12 Months Ended
	Dec. 31, 2012
Weighted Average Remaining Lease Term	12 years 1 month 6 days
Walgreens Co [Member]
Percentage Of Future Minimum Rentals Income	38.60%
Kmart Corporation [Member]
Percentage Of Future Minimum Rentals Income	1.30%
Cvs Caremark Corporation [Member]
Percentage Of Future Minimum Rentals Income	9.70%
Minimum [Member]
Lease Agreement Term	5 years
Maximum [Member]
Lease Agreement Term	25 years