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Shares and Stockholders' Equity (Changes In Common stock (Number Of Shares)) (Details) - shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 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 | 193,247,103 |  | 193,247,103 |
Common stock as of End-of-Period |  |  |  |
Basic basis | 193,247,103 | 200,775,731 | 193,247,103 | 200,775,731
Diluted basis | 193,962,833 | 202,245,662 | 193,962,833 | 202,245,662
Common Stock [Member] |  |  |  |
Changes In Common Stock (Number Of Shares) [Line Items] |  |  |  |
Balance as of beginning-of-period | 193,208,244 | 202,987,229 | 196,668,532 | 205,862,760
Stock issued for exercise of warrants |  | 18,493 |  | 222,023
Stock compensation/issued for benefit plans | 38,859 | 83,405 | 388,495 | 893,075
Retirement/cancellation of shares |  | (2,313,396) | (3,809,924) | (6,202,127)
Balance as of end-of-period | 193,247,103 | 200,775,731 | 193,247,103 | 200,775,731

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