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Subsequent Events (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Dividend Declared [Member]
Jan. 14, 2013
Maximum [Member]
Subsequent Event [Line Items]      
Percentage of annual profits that may be allocated to dividends     50.00%
Dividend declaration date Mar. 18, 2013    
Dividend declared per share $ 0.55    
Dividend, date payable Apr. 17, 2013    
Dividend payable, date of record Apr. 04, 2013    
Subsequent event, amount   $ 3.9