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Shares And Stockholders' Equity (Reconciliation Of The Denominator Calculations Of Basic And Diluted EPS) (Details) - shares
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
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 189,987,670 193,228,547 190,878,951 194,152,672
Shares to cover non-vested stock 1,278,175 448,982 1,133,618 651,289
Average stock options outstanding during the period 1,902,854 572,544 1,483,184 784,396
Assumed acquisition of shares with assumed proceeds and benefits from exercising stock options (at average market price for the period) (1,462,891) (469,928) (1,114,026) (586,764)
Shares repurchasable from measured but unrecognized stock option expense (38,204) (3,693) (19,715) (1,846)
Average deferred compensation shares 534,794     1,236,744
Weighted-average shares, as used in diluted calculation 192,202,398 193,776,452 192,362,012 196,236,491