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SHAREHOLDERS' EQUITY (Common Shares Issued and Outstanding) (Details) - shares shares in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Shares issued, balance at beginning of period (in shares) |  |  | 176,580 |  |
Total shares issued at end of period (in shares) | 176,580 |  | 176,580 |  |
Treasury shares, balance at beginning of period (in shares) |  |  | (92,227) |  |
Total treasury shares at end of period (in shares) | (91,813) |  | (91,813) |  |
Total shares outstanding (in shares) | 84,767 |  | 84,767 |  | 84,353
Common stocks |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Shares issued, balance at beginning of period (in shares) | 176,580 | 176,580 | 176,580 | 176,580 |
Shares issued (in shares) | 0 | 0 | 0 | 0 |
Total shares issued at end of period (in shares) | 176,580 | 176,580 | 176,580 | 176,580 |
Treasury shares, balance at beginning of period (in shares) | (91,827) | (92,282) | (92,227) | (92,621) |
Shares repurchased (in shares) | (8) | (3) | (197) | (153) |
Shares reissued (in shares) | 22 | 11 | 611 | 500 |
Total treasury shares at end of period (in shares) | (91,813) | (92,274) | (91,813) | (92,274) |
Total shares outstanding (in shares) | 84,767 | 84,306 | 84,767 | 84,306 |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: 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=120391452&loc=d3e13212-122682 + Details
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