Declaration of Dividends (Details) (USD $)	3 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012
Declaration of Dividends [Abstract]
Dividends on common stock (in dollars per share)	$ 0.07	$ 0.07	$ 0.07	$ 0.07
Dividends Payable, Date of Record	Dec. 14, 2012	Sep. 14, 2012	Jun. 15, 2012	Mar. 15, 2012
Dividends Payable, Date Declared	Oct. 31, 2012	Jul. 18, 2012	Apr. 18, 2012	Jan. 25, 2012
Dividends Payable, Date to be Paid	Jan. 02, 2013	Oct. 01, 2012	Jul. 02, 2012	Apr. 02, 2012