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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Changes In Preferred And Common Stock Number Of Shares [Line Items] |  |  |  |
Balance as of beginning-of-period |  |  | 218,090,114 |
Balance as of end-of-period | 214,776,806 |  | 214,776,806 |
Common stock as of End-of-period: |  |  |  |
Basic basis | 214,776,806 | 219,544,618 | 214,776,806 | 219,544,618
Diluted basis | 217,390,897 | 222,701,021 | 217,390,897 | 222,701,021
Common Stock [Member] |  |  |  |
Changes In Preferred And Common Stock Number Of Shares [Line Items] |  |  |  |
Balance as of beginning-of-period | 217,294,051 | 222,237,262 | 218,090,114 | 226,335,105
Stock issued for exercise of warrants | 97,076 | 2,464 | 119,942 | 337,394
Stock compensation/issued for benefit plans | 38,642 | 139,179 | 675,608 | 1,600,465
Retirement/cancellation of shares | (2,652,963) | (2,834,287) | (4,108,858) | (8,728,346)
Balance as of end-of-period | 214,776,806 | 219,544,618 | 214,776,806 | 219,544,618

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- Definition Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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