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Shares And Stockholders' Equity (Reconciliation Of The Denominator Calculations Of Basic And Diluted EPS) (Details) - shares
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
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 195,076,797 204,290,759
Shares to cover exercise of outstanding warrants   173,837
Shares to cover non-vested stock 853,597 1,049,556
Average stock options outstanding during the period 996,248 1,519,184
Assumed acquisition of shares with assumed proceeds from exercising outstanding warrants   (29,176)
Assumed acquisition of shares with assumed proceeds and benefits from exercising stock options (at average market price for the period) (703,600) (1,041,630)
Shares repurchasable from measured but unrecognized stock option expense   (867)
Average deferred compensation shares 1,041,800  
Weighted-average shares, as used in diluted calculation 197,264,842 205,961,663