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Stockholder's Equity (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Stockholders' Equity (Textual) [Abstract]        
Treasury stock, shares, acquired 0 35,000 0 85,000
Weighted-average purchase prices per share   $ 57.17   $ 56.65
Total cost of treasury shares acquired   $ 2.0   $ 4.8
Common stock remaining for repurchase 195,000   195,000