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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Changes In Common Stock (Number Of Shares) [Line Items] |  |  |  |
Balance as of beginning-of-year |  |  | 205,862,760 |
Balance as of end-of-period | 198,327,250 |  | 198,327,250 |
Common stock as of End-of-Period |  |  |  |
Basic basis | 198,327,250 | 214,776,806 | 198,327,250 | 214,776,806
Diluted basis | 200,724,744 | 217,390,897 | 200,724,744 | 217,390,897
Common Stock [Member] |  |  |  |
Changes In Common Stock (Number Of Shares) [Line Items] |  |  |  |
Balance as of beginning-of-year | 200,775,731 | 217,294,051 | 205,862,760 | 218,090,114
Stock issued for exercise of warrants | 36,610 | 97,076 | 258,633 | 119,942
Stock compensation/issued for benefit plans | 41,006 | 38,642 | 934,081 | 675,608
Retirement/cancellation of shares | (2,526,097) | (2,652,963) | (8,728,224) | (4,108,858)
Balance as of end-of-period | 198,327,250 | 214,776,806 | 198,327,250 | 214,776,806

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