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Consolidated Statements of Stockholders' Equity Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]      
Preferred Stock, Shares Authorized 2,000,000 2,000,000  
Preferred Stock, Par or Stated Value Per Share $ 0.01 $ 0.01  
Shares Held In Trust For Deferred Compensation Plan 105,087 95,329 97,053
Dividends Declared $ 1.7250 $ 1.5850 $ 1.4350
Shares Issued Under Performance Incentive Plan Withheld For Employee Taxes 10,319 7,635 16,918