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Subsequent Event (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jul. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Subsequent Event [Line Items]          
Quarterly dividend declared, per common share (in dollars per share)   $ 0.125 $ 0.125 $ 0.250 $ 0.125
Subsequent Event [Member]          
Subsequent Event [Line Items]          
Quarterly dividend declared, per common share (in dollars per share) $ 0.125        
Quarterly dividend declared, cash outlay $ 1.6