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Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cumulative effect of change in accounting principle tax | $ 925 |  |
RETAINED EARNINGS [Member] |  |  |
Dividend on common stock | $ 1.32 | $ 1.24 | $ 1.02

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