Cash Dividends (Details) (USD $)	1 Months Ended			3 Months Ended
	Dec. 31, 2012	Nov. 30, 2012	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Cash Dividends
Cash dividends, per share (in dollars per share)	$ 0.15		$ 0.07	$ 0.15	$ 0.07
Cash dividend paid, per share		$ 0.07