Declaration of Dividends (Details) - $ / shares				3 Months Ended		6 Months Ended
	Jul. 15, 2015	Apr. 15, 2015	Jan. 21, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Dividends Payable [Line Items]
Dividends on common stock (in dollars per share)		$ 0.09	$ 0.09	$ 0.09	$ 0.09	$ 0.18	$ 0.18
Series C Preferred stock
Dividends Payable [Line Items]
Preferred stock dividend rate (in hundredth)		1.00%	1.00%
Subsequent event
Dividends Payable [Line Items]
Dividends on common stock (in dollars per share)	$ 0.09
Subsequent event | Series C Preferred stock
Dividends Payable [Line Items]
Preferred stock dividend rate (in hundredth)	1.00%