Statements Of Changes In Shareholders' Equity (Deficit) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Statements Of Changes In Shareholders' Equity (Deficit) [Abstract]
Shareholders' equity (deficit) - beginning of period	$ (975,307)	$ 571,784	$ (387,329)
Net income (loss)	234,419	2,739	(31,561)
Adjustment of redeemable Shares to redemption value	(4,364,293)	(1,549,830)	990,674
Shareholders' equity (deficit) - end of period	$ (5,105,181)	$ (975,307)	$ 571,784