Subsequent Event (Details Textual) (USD $)	1 Months Ended			3 Months Ended	12 Months Ended
	Feb. 28, 2013	Oct. 31, 2012	Aug. 31, 2012	Sep. 30, 2012	Dec. 31, 2012
Subsequent Event (Textual) [Abstract]
Dividends declared per share	$ 0.15	$ 10.00	$ 10.00	$ 10.00	$ 10.15
Special cash dividend payable date	Mar. 29, 2013			Oct. 19, 2012
Date of record for special cash dividend payable	Mar. 19, 2013			Sep. 28, 2012