XML 83 R72.htm IDEA: XBRL DOCUMENT v3.21.1
Shares And Stockholders' Equity (Reconciliation Of The Denominator Calculations Of Basic And Diluted EPS) (Details) - shares
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
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 191,780,135 195,076,797
Shares to cover non-vested stock 989,064 853,597
Average stock options outstanding during the period 1,063,513 996,248
Assumed acquisition of shares with assumed proceeds and benefits from exercising stock options (at average market price for the period) (765,162) (703,600)
Shares repurchasable from measured but unrecognized stock option expense (1,225)  
Average deferred compensation shares   1,041,800
Weighted-average shares, as used in diluted calculation 193,066,325 197,264,842