Common Stock Tax Treatment of Dividends (Details) (USD $)	3 Months Ended				12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Dividends Payable [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.09506	$ 0.09506	$ 0.09506	$ 0.09506	$ 0.38517	$ 0.09506
Return of Capital [Member]
Dividends Payable [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.09506	$ 0.09506	$ 0.09506	$ 0.09506	$ 0.28518	$ 0.09506
Current Year [Domain]
Dividends Payable [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.09506	$ 0.09506	$ 0.09506	$ 0.09506	$ 0.28518	$ 0.09506