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Subsequent Event (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
1 Months Ended
Jun. 20, 2012
Dividend Declared
Jul. 12, 2012
Acquisition
Subsequent Event [Line Items]    
Dividend declared date Jun. 20, 2012  
Cash dividend declared, per share (dollars per share) $ 0.5  
Dividend payment date Aug. 01, 2012  
Dividend record date Jul. 10, 2012  
Cash paid to acquire restaurants   $ 585.0