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Shares and Stockholders' Equity (Changes In Common stock (Number Of Shares)) (Details) - shares | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 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 | 202,987,229 |
Common stock as of End-of-Period |  |
Basic basis | 202,987,229 | 218,695,476
Diluted basis | 204,200,031 | 222,379,443
Common Stock [Member] |  |
Changes In Common Stock (Number Of Shares) [Line Items] |  |
Balance as of beginning-of-year | 205,862,760 | 218,090,114
Stock issued for exercise of warrants | 203,530 | 20,040
Stock compensation/issued for benefit plans | 809,670 | 585,322
Retirement/cancellation of shares | (3,888,731) |
Balance as of end-of-period | 202,987,229 | 218,695,476

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