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CONSOLIDATED STATEMENTS OF Earnings and Retained Earnings (Parenthetical)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
CONSOLIDATED STATEMENTS OF Earnings and Retained Earnings        
Stock dividends (as a percent) 3.00% 3.00% 3.00% 3.00%