Real Estate (Details 5)	Jun. 30, 2012
Rental Income [Abstract]
Percentage of aggregate rental income	100.00%
LTI [Member] | Carlsbad, CA [Member]
Rental Income [Abstract]
Percentage of aggregate rental income	22.10%
Plainfield [Member] | Plainfield, IL [Member]
Rental Income [Abstract]
Percentage of aggregate rental income	14.00%
AT&T [Member] | Redmond, WA [Member]
Rental Income [Abstract]
Percentage of aggregate rental income	13.60%
Will Partners [Member] | Monee, IL [Member]
Rental Income [Abstract]
Percentage of aggregate rental income	12.50%
Renfro [Member] | Clinton, SC [Member]
Rental Income [Abstract]
Percentage of aggregate rental income	10.10%
Westinghouse [Member] | Cranberry Township, PA [Member]
Rental Income [Abstract]
Percentage of aggregate rental income	8.50%
Emporia Partners [Member] | Emporia, KS [Member]
Rental Income [Abstract]
Percentage of aggregate rental income	7.40%
Quad/Graphics [Member] | Loveland, CO [Member]
Rental Income [Abstract]
Percentage of aggregate rental income	6.60%
ITT [Member] | Los Angeles, CA [Member]
Rental Income [Abstract]
Percentage of aggregate rental income	4.10%
GE [Member] | Whippany, NJ [Member]
Rental Income [Abstract]
Percentage of aggregate rental income	1.00%
Travelers [Member] | Greenwood Village, CO [Member]
Rental Income [Abstract]
Percentage of aggregate rental income	0.10%