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Subsequent Events (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Mar. 02, 2016
Apr. 15, 2016
Mar. 31, 2016
Mar. 31, 2015
Subsequent Event [Line Items]        
Common Stock, Dividends, Per Share, Declared     $ 0.25 $ 0.20
Common Class A [Member]        
Subsequent Event [Line Items]        
Common Stock, Dividends, Per Share, Declared $ 0.25      
Common Class B [Member]        
Subsequent Event [Line Items]        
Common Stock, Dividends, Per Share, Declared $ 0.25      
Subsequent Event [Member]        
Subsequent Event [Line Items]        
Dividends   $ 1.5