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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]      
Cash dividends, per share $ 0.89 $ 0.72 $ 0.68
Stock issued pursuant to stock-based compensation 33,039 29,378 47,779
Stock Issued During Period, Shares, Purchase of Assets 169,143 50,215 247,002