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Share-Based Compensation Arrangements (Tables)
6 Months Ended
Jun. 30, 2012
Share-Based Compensation Arrangements [Abstract]  
Fair value of stock appreciation rights

The fair value of each SAR was estimated as of June 30, 2012 and 2011 using the following assumptions:

 

                 
    June 30, 2012     June 30, 2011  

Risk-free interest rate

    0.38-0.63     1.17-1.97

Dividend yield

    0.0     0.0

Expected life (years)

    2.7-4.5 years       3.7-5.5 years  

Volatility

    66.50     83.21