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Share-Based Compensation Plans (Tables)
6 Months Ended
Jun. 30, 2012
Share-Based Compensation Plans [Abstract]  
Black-Scholes option-pricing model
         

Assumption

     

Expected Term (years)

    3.0  

Risk-Free Interest Rate

    0.39

Expected Dividend Yield

    8.21

Expected Volatility

    21.12

Expected Forfeiture Rate

    1.0