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SHAREHOLDERS' EQUITY (Description of Plans) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Jan. 31, 2021 | Nov. 30, 2020 | Apr. 11, 2019 | Dec. 31, 2010 | Oct. 31, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Cash dividend declare per share |  |  | $ 0.36 | $ 0.45 |  |
Dividend payable |  |  | $ 19,999 | $ 24,864 |  |
Subsequent Event [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Cash dividend declare per share |  | $ 0.63 |  |  |  |
Dividend payable |  | $ 35,003 |  |  |  |
Second Anniversary [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vested percentage | 50.00% |  |  |  |  |
Third and Fourth Anniversary [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vested percentage | 25.00% |  |  |  |  |
2008 Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total number of shares authorized |  |  |  |  | 6,015,500 |
Shares available for grant | 200,388 |  |  |  | 7,015,500 | 1,000,000
Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period for plan | 3 years |  |  |  |  |
Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period for plan | 4 years |  |  |  |  |
Option One [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Expiration period | 6 years |  |  |  |  |
Option Two [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Expiration period | 7 years |  |  |  |  |
Option Three [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Expiration period | 10 years |  |  |  |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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