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Shares and Stockholders' Equity (Changes In Common stock (Number Of Shares)) (Details) - shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Changes In Common Stock (Number Of Shares) [Line Items] |  |  |  |
Balance as of beginning-of-period |  |  | 196,668,532 |
Balance as of end-of-period | 193,254,948 |  | 193,254,948 |
Common stock as of End-of-Period |  |  |  |
Basic basis | 193,254,948 | 198,327,250 | 193,254,948 | 198,327,250
Diluted basis | 195,331,049 | 200,724,744 | 195,331,049 | 200,724,744
Common Stock [Member] |  |  |  |
Changes In Common Stock (Number Of Shares) [Line Items] |  |  |  |
Balance as of beginning-of-period | 193,247,103 | 200,775,731 | 196,668,532 | 205,862,760
Stock issued for exercise of warrants |  | 36,610 |  | 258,633
Stock compensation/issued for benefit plans | 7,845 | 41,006 | 396,340 | 934,081
Retirement/cancellation of shares |  | (2,526,097) | (3,809,924) | (8,728,224)
Balance as of end-of-period | 193,254,948 | 198,327,250 | 193,254,948 | 198,327,250

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