Shares And Stockholders' Equity (Reconciliation Of The Denominator Calculations Of Basic And Diluted EPS) (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 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	169,706,526	187,276,859	171,647,108	189,665,059
Shares to cover non-vested stock	779,215	1,451,686	1,011,546	1,239,640
Average stock options outstanding during the period	380,706	1,847,513	1,236,484	1,604,627
Assumed acquisition of shares with assumed proceeds and benefits from exercising stock options (at average market price for the period)	(280,067)	(1,444,711)	(978,538)	(1,224,255)
Shares repurchasable from measured but unrecognized stock option expense		(40,280)	(28,008)	(26,570)
Average deferred compensation shares	508,980		507,487
Weighted-average shares, as used in diluted calculation	171,095,360	189,091,067	173,396,079	191,258,501