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Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]      
Purchase of treasury stock (in shares) 519,387 111,754 304,512
Restricted share units converted to common stock (in shares)   52,173  
Cash dividends per common share (in dollars per share) $ 0.25 $ 0.50 $ 0.50