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ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Accumulated Other Comprehensive Loss (Parenthetical) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract] |  |  |  |
Reclassification to net income | [1] | $ 2,556 | $ 2,548 | $ 1,661
[1] | The Company reclassified amortization of prior service cost, actuarial loss and plan amendment cost for its retirement plan from accumulated other comprehensive loss to net income of $2.6 million, $2.5 million and $1.7 million for the years ended December 31, 2020, 2019 and 2018, respectively.

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