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Shareholders' Equity Cash Dividends Declared Per Common Share (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Equity [Abstract]        
Cash dividends declared and paid per common share (in dollars per share) $ 0.53 $ 0.48 $ 1.59 $ 1.44