Shares And Stockholders' Equity (Reconciliation Of The Denominator Calculations Of Basic And Diluted EPS) (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 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	169,645,881	169,706,526	169,529,509	171,647,108
Shares to cover non-vested stock	620,088	779,215	504,949	1,011,546
Average stock options outstanding during the period	42,457	380,706	24,862	1,236,484
Assumed acquisition of shares with assumed proceeds and benefits from exercising stock options (at average market price for the period)	(37,461)	(280,067)	(21,377)	(978,538)
Shares repurchasable from measured but unrecognized stock option expense	(2,045)		(682)	(28,008)
Average deferred compensation shares	621,582	508,980	588,183	507,487
Weighted-average shares, as used in diluted calculation	170,890,502	171,095,360	170,625,444	173,396,079