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Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Condensed Consolidated Statements of Shareholders' Equity (Unaudited)        
Cash dividends (in dollars per share) $ 0.35 $ 0.30 $ 0.95 $ 0.80