Special Cash Dividend (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended	9 Months Ended
	Oct. 31, 2012	Sep. 30, 2012	Sep. 30, 2012
Special Cash Dividend (Textual) [Abstract]
Special cash dividend declared per share	$ 0.15	$ 10.00	$ 10.00
Special cash dividend		$ 88.8
Special cash dividend payable date	Dec. 17, 2012	Oct. 19, 2012
Date of record for special cash dividend payable	Nov. 30, 2012	Sep. 28, 2012