Financial Highlights (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended
Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Oct. 08, 2010
Financial Highlights [Abstract]
Market based total return	7.16%	46.99%	(13.04%)
Opening Trade Price				$ 21.50

Total return for the period based upon the closing prices as reported by the New York Stock Exchange. Calculation of market based total return assumes the reinvestment of dividends at the closing price as reported by the New York Stock Exchange as of the ex-date.

No definition available.

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration