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Per Share Data (Narrative) (Details) - shares
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Earnings Per Share [Abstract]    
Weighted average number of shares held in grantor trust 7,575,168 7,389,781
Antidilutive securities excluded from computation of earnings per share, amount (in shares) 2,000,000.0