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Subsequent Events (Details) - $ / shares
3 Months Ended 9 Months Ended
Oct. 20, 2015
Jul. 20, 2015
Sep. 29, 2015
Sep. 30, 2014
Sep. 29, 2015
Sep. 30, 2014
Subsequent events            
Cash dividends declared per common share (in dollars per share)   $ 0.20 $ 0.20 $ 0.165 $ 0.53 $ 0.445
Subsequent event            
Subsequent events            
Cash dividends declared per common share (in dollars per share) $ 0.20