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Change of Control (Details) (Icahn, USD $)
 12 Months Ended
Dec. 31, 2012
May 31, 2012
Icahn
    
Change of Control    
Price per share   $ 30.00
Number of non-transferable contingent cash payments right for each Share (in shares)   1
Ownership percentage held by controlling stockholder 82.00%  
Offer price per Share on restricted stock awards vested in 2012 $ 30.00  
Number of non-transferable contingent cash payments right for each restricted stock awards vested in 2012 (in shares) 1