Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) (Parenthetical)

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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) (Parenthetical) - $ / shares
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]        
Purchase of treasury stock (in shares) 143,092 186,417 260,621 75,765
Issuance of treasury stock (in shares)   2,822 102,856 223,971
Cancellations of treasury stock (in shares) 41 19,433   5,214
Dividends, per share (in dollars per share) $ 0.2 $ 0.20 $ 0.19 $ 0.19