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Stock Based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Summary the stock option transactions    
Number of Options Outstanding at January 1, 2012 227,747  
Weighted Average Exercise Price Outstanding, at January 1, 2012 $ 49.86  
Weighted Average Remaining Contractual Term (Years)   3 years 7 months 6 days
Aggregate Intrinsic Value Outstanding, at January 1, 2012 $ 135,886  
Number of Options Granted     
Weighted Average Exercise Price, Granted     
Number of Options Exercised     
Weighted Average Exercise Price, Exercised     
Number of Options Expired (24,886)  
Weighted Average Exercise Price, Expired $ 82.25  
Number of Options Forfeited     
Weighted Average Exercise Price, Forfeited     
Number of Options Outstanding and exercisable at September 30, 2012 202,861  
Weighted Average Exercise Price, Outstanding and exercisable at September 30, 2012 $ 45.89  
Weighted Average Remaining Contractual Term (Years), Outstanding and exercisable at September 30, 2012 3 years 2 months 12 days  
Aggregate Intrinsic Value, Outstanding and exercisable at September 30, 2012 $ 532,848