Shares and Stockholders' Equity (Reconciliation Of The Denominator Calculations Of Basic And Diluted EPS) (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 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	169,581,636	171,130,192	169,470,359	172,633,482
Shares to cover non-vested stock	326,632	895,347	447,379	1,127,609
Average stock options outstanding during the period	5,707	1,031,878	16,065	1,664,374
Assumed acquisition of shares with assumed proceeds and benefits from exercising stock options (at average market price for the period)	(5,469)	(829,921)	(13,335)	(1,327,773)
Shares repurchasable from measured but unrecognized stock option expense		(12,772)		(42,013)
Average deferred compensation shares	589,001	492,269	571,484	506,740
Weighted-average shares, as used in diluted calculation	170,497,507	172,706,993	170,491,952	174,562,419