Declaration of Dividends (Details) - $ / shares					3 Months Ended		9 Months Ended
	Oct. 21, 2015	Jul. 15, 2015	Apr. 15, 2015	Jan. 21, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Dividends Payable [Line Items]
Dividends on common stock (in dollars per share)		$ 0.09	$ 0.09	$ 0.09	$ 0.09	$ 0.09	$ 0.27	$ 0.26
Subsequent Event [Member]
Dividends Payable [Line Items]
Dividends on common stock (in dollars per share)	$ 0.09
Series C Preferred stock
Dividends Payable [Line Items]
Preferred stock dividend rate		1.00%	1.00%	1.00%
Series C Preferred stock | Subsequent Event [Member]
Dividends Payable [Line Items]
Preferred stock dividend rate	1.00%