Subsequent Events (Details) (USD $)	3 Months Ended		0 Months Ended	1 Months Ended		0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Jan. 02, 2014 Common shares	Oct. 31, 2013 Common shares	Jul. 31, 2013 Common shares	Apr. 03, 2014 Common shares Subsequent event
Subsequent Event [Line Items]
Dividends paid per common share	$ 0.500	$ 0.375	$ 0.500	$ 0.50	$ 0.50	$ 0.50