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Subsequent Events - Narrative (Details) - $ / shares
3 Months Ended 6 Months Ended
Jul. 31, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Subsequent Event [Line Items]          
Dividends declared per share (in dollars per share)   $ 0.11 $ 0.11 $ 0.22 $ 0.22
Subsequent Events [Member]          
Subsequent Event [Line Items]          
Date of announcement of dividend Jul. 31, 2015        
Dividends declared per share (in dollars per share) $ 0.11        
Date of payment of dividend Aug. 28, 2015        
Date of record of dividend Aug. 14, 2015