Shares And Stockholders' Equity (Reconciliation Of The Denominator Calculations Of Basic And Diluted EPS) (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 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	171,130,192	189,987,670	172,633,482	190,878,951
Shares to cover non-vested stock	895,347	1,278,175	1,127,609	1,133,618
Average stock options outstanding during the period	1,031,878	1,902,854	1,664,374	1,483,184
Assumed acquisition of shares with assumed proceeds and benefits from exercising stock options (at average market price for the period)	(829,921)	(1,462,891)	(1,327,773)	(1,114,026)
Shares repurchasable from measured but unrecognized stock option expense	(12,772)	(38,204)	(42,013)	(19,715)
Average deferred compensation shares	492,269	534,794	506,740
Weighted-average shares, as used in diluted calculation	172,706,993	192,202,398	174,562,419	192,362,012