Subsequent Events (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended			9 Months Ended		1 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Oct. 31, 2013 Dividend declared, July 2013
Subsequent Events
Cash dividends declared per common share (in dollars per share)	$ 0.125	$ 0.25	$ 0.125	$ 0.250	$ 0.375	$ 0.125
Cash dividend declared		$ 12,106		$ 12,083	$ 18,119	$ 6,000