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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, 2018
Mar. 31, 2017
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 218,368,994 225,619,803
Shares to cover exercise of outstanding warrants 642,787 1,023,429
Shares to cover non-vested stock 1,592,959 1,675,799
Average stock options outstanding during the period 1,969,591 2,681,129
Assumed acquisition of shares with assumed proceeds from exercising outstanding warrants (81,088) (150,236)
Assumed acquisition of shares with assumed proceeds and benefits from exercising stock options (at average market price for the period) (1,103,154) (1,619,156)
Shares repurchaseable from measured but unrecognized stock option expense (24,578) (77,078)
Average deferred compensation shares 922,061 949,815
Weighted-average shares, as used in diluted calculation 222,287,572 230,103,505