Income Taxes (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Dividends per share
Amount Per Share	$ 0.600	$ 0.640	$ 0.640
Dividends paid percentage	100.00%	100.00%	100.00%
Non-qualified dividends [Member]
Dividends per share
Amount Per Share		$ 0.477	$ 0.568
Dividends paid percentage		74.53%	88.75%
Qualified Dividends [Member]
Dividends per share
Amount Per Share		$ 0.095	$ 0.028
Dividends paid percentage		14.78%	4.37%
Non-taxable return of capital [Member]
Dividends per share
Amount Per Share	$ 0.600	$ 0.068	$ 0.044
Dividends paid percentage	100.00%	10.69%	6.88%