Subsequent Events (Details) (USD $)	1 Months Ended	9 Months Ended
	Oct. 31, 2012	Sep. 30, 2012	Nov. 15, 2012
Subsequent Events (Textuals) [Abstract]
Cash dividend declared per common share	0.25
Conversion price of note		48.29	$ 48.28
Dividend declared
Subsequent Events (Textuals) [Abstract]
Subsequent event amount	4,900,000
Convertible Notes
Subsequent Events (Textuals) [Abstract]
Conversion rate of common stock shares per $1,000 of principal amount	20.7111	20.7076
Principal amount in conversion feature			$ 1,000
Call Options
Subsequent Events (Textuals) [Abstract]
Exercise price of call options		48.29	$ 48.28
Warrants
Subsequent Events (Textuals) [Abstract]
Exercise price per share of Warrants		61.32	61.31