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Stockholder's Equity (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Stockholders' Equity (Textual) [Abstract]        
Treasury stock, shares, acquired 35,000 50,000 35,000 135,000
Weighted-average purchase prices per share $ 87.41 $ 60.94 $ 87.41 $ 58.24
Total cost of treasury shares acquired $ 3.1 $ 3.1 $ 3.1 $ 7.9
Common stock remaining for repurchase 160,000   160,000