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Shares And Stockholders' Equity (Reconciliation Of The Denominator Calculations Of Basic And Diluted EPS) (Details) - shares
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Reconciliation of the denominator (number of shares) in the calculations of basic and diluted earnings (loss) per common share    
Weighted-average shares, as used in basic calculation 174,153,475 191,780,135
Shares to cover non-vested stock 1,359,873 989,064
Average stock options outstanding during the period 2,296,869 1,063,513
Assumed acquisition of shares with assumed proceeds and benefits from exercising stock options (at average market price for the period) (1,825,626) (765,162)
Shares repurchasable from measured but unrecognized stock option expense (71,253) (1,225)
Average deferred compensation shares 521,211  
Weighted-average shares, as used in diluted calculation 176,434,549 193,066,325