Annual report pursuant to Section 13 and 15(d)

Subsequent Events (Details)

v2.4.0.6
Subsequent Events (Details) (Subsequent Event [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Subsequent Event [Member]
 
Subsequent Events (Textual) [Abstract]  
Shares repurchase of Class A common stock $ 100.0
Total remaining repurchase authorization $ 49.6