Statements of Changes in Shareholders' Equity (Deficit) (USD $) In Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Statements of Changes in Shareholders' Equity (Deficit)
Shareholders' equity (deficit) - beginning of period	$ (5,105,181)	$ (975,307)
Net income	2,420,400	234,419
Adjustment of redeemable capital Shares to redemption value	(1,711,218)	(4,364,293)
Shareholders' equity (deficit) - end of period	$ (4,395,999)	$ (5,105,181)