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Shares and Stockholders' Equity (Changes In Common stock (Number Of Shares)) (Details) - shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Changes In Common Stock (Number Of Shares) [Line Items] |  |  |
Balance as of beginning-of-year | 192,329,691 |  |
Balance as of end-of-year | 177,193,515 | 192,329,691 |
Common Stock [Member] |  |  |
Changes In Common Stock (Number Of Shares) [Line Items] |  |  |
Balance as of beginning-of-year | 192,329,691 | 196,668,532 | 205,862,760
Stock issued for exercise of warrants |  |  | 258,633
Stock compensation/issued for benefit plans | 1,106,572 | 547,209 | 942,318
Retirement/cancellation of shares | (16,242,748) | (4,886,050) | (10,395,179)
Balance as of end-of-year | 177,193,515 | 192,329,691 | 196,668,532
Common stock as of End-of-Year |  |  |
Basic basis | 177,193,515 | 192,329,691 | 196,668,532
Diluted basis | 179,229,110 | 193,672,296 | 199,196,043

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