Dividends (Details) (USD $)	3 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013
Dividends [Abstract]
Dividends paid per common share (in dollars per share)	$ 0.55	$ 0.55	$ 0.55	$ 0.5	$ 0.5	$ 0.5