Shareholders' Equity (Details) - Schedule of Unit Redemption (Redemptions [Member])	3 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012
Redemptions [Member]
Shareholders' Equity (Details) - Schedule of Unit Redemption [Line Items]
Total Requested Unit Redemptions at Redemption Date	20,938,382	19,485,287	19,112,925	18,607,044	18,397,381	18,910,430
Units Redeemed (in Shares)	657,736	434,573	391,142	362,553	454,638	454,405
Total Redemption Requests Not Redeemed at Redemption Date	20,280,646	19,050,714	18,721,783	18,244,491	17,942,743	18,456,025