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Subsequent Event (Details) - $ / shares
Jul. 29, 2015
Jun. 19, 2015
Mar. 19, 2015
Subsequent event      
Quarterly cash dividend (in dollars per share)   $ 0.125 $ 0.125
Dividends payable date of record   May 29, 2015 Feb. 27, 2015
Subsequent event      
Subsequent event      
Quarterly cash dividend (in dollars per share) $ 0.125    
Dividends payable date declared Jul. 29, 2015    
Dividends payable date of record Aug. 28, 2015    
Dividends payable date to be paid Sep. 18, 2015