Shares and Stockholders' Equity (Reconciliation Of The Denominator Calculations Of Basic And Diluted EPS) (Details) - shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
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	169,357,846	174,153,475
Shares to cover non-vested stock	568,126	1,359,873
Average stock options outstanding during the period	26,423	2,296,869
Assumed acquisition of shares with assumed proceeds and benefits from exercising stock options (at average market price for the period)	(21,201)	(1,825,626)
Shares repurchasable from measured but unrecognized stock option expense		(71,253)
Average deferred compensation shares	553,966	521,211
Weighted-average shares, as used in diluted calculation	170,485,160	176,434,549