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Stock-Based Compensation (Details 3) (Stock options, USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Stock options
    
Stock option activity    
Outstanding, at the beginning of the year (in shares) 30,000 100,000
Exercised (in shares) (30,000) (70,000)
Outstanding, at the end of the year (in shares)   30,000
Options exercisable (in shares)   30,000
Weighted-Average Exercise Price (in dollars per share)    
Outstanding, at the beginning of the year (in dollars per share) $ 11.90 $ 11.90
Exercised (in dollars per share) $ 11.90 $ 11.90
Outstanding, at the end of the year (in dollars par share)   $ 11.90
Options exercisable (in dollars per share)   $ 11.90
Additional disclosure abstract    
Total intrinsic value of options exercised $ 0.2 $ 0.5