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Shares And Stockholders' Equity (Reconciliation Of The Denominator Calculations Of Basic And Diluted EPS) (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 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 193,228,547 201,498,137 194,152,672 202,886,733
Shares to cover exercise of outstanding warrants   57,189   115,513
Shares to cover non-vested stock 448,982 831,385 651,289 940,471
Average stock options outstanding during the period 572,544 1,647,523 784,396 1,583,354
Assumed acquisition of shares with assumed proceeds from exercising outstanding warrants   (8,610)   (18,893)
Assumed acquisition of shares with assumed proceeds and benefits from exercising stock options (at average market price for the period) (469,928) (1,119,711) (586,764) (1,080,671)
Shares repurchasable from measured but unrecognized stock option expense (3,693)   (1,846) (434)
Average deferred compensation shares     1,236,744  
Weighted-average shares, as used in diluted calculation 193,776,452 202,905,913 196,236,491 204,426,073