Capitalization (Details 2) (USD $)	1 Months Ended	9 Months Ended
	Nov. 30, 2011	Sep. 30, 2012 quarter	Sep. 30, 2011
Share Redemption Program
Value of shares redeemed		$ 3,062,000	$ 3,212,000
Exceptional redemptions
Share Redemption Program
Amount of funding limit	1,000,000
Number of shares considered for each redemption period	220,000
Redemption limit expressed as a percentage of weighted average number of shares outstanding		5.00%
Period for which weighted average number of shares are outstanding to calculate redemption limit		12 months
Number of trailing fiscal quarters considered for calculating proceeds from distribution reinvestment plan ("DRP") to limit funds for redemption		4
Holding period that can be waived at the discretion of the board		1 year
Number of shares redeemed		700,000	700,000
Value of shares redeemed		$ 3,100,000	$ 3,200,000