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v3.20.1

Shares and Stockholders' Equity (Changes In Common stock (Number Of Shares)) (Details) - shares | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Changes In Common Stock (Number Of Shares) [Line Items] |  |
Balance as of beginning-of-year | 196,668,532 |
Balance as of end-of-period | 193,208,244 |
Common stock as of End-of-Period |  |
Basic basis | 193,208,244 | 202,987,229
Diluted basis | 195,027,909 | 204,200,031
Common Stock [Member] |  |
Changes In Common Stock (Number Of Shares) [Line Items] |  |
Balance as of beginning-of-year | 196,668,532 | 205,862,760
Stock issued for exercise of warrants |  | 203,530
Stock compensation/issued for benefit plans | 349,636 | 809,670
Retirement/cancellation of shares | (3,809,924) | (3,888,731)
Balance as of end-of-period | 193,208,244 | 202,987,229

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