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ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
BALANCE |  | $ 811,449 | $ 690,506 | $ 659,054
Other comprehensive gain (loss) before reclassification |  | (21,578) | (3,311) | (6,431)
Reclassification to net income | [1] | 2,556 | 2,548 | 1,661
TOTAL OTHER COMPREHENSIVE LOSS |  | (19,022) | (763) | (4,770)
BALANCE |  | 912,714 | 811,449 | 690,506
Unrealized gain (loss) on available-for-sale securities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
BALANCE |  | 191 | 10 | (258)
Other comprehensive gain (loss) before reclassification |  | (100) | 181 | 268
TOTAL OTHER COMPREHENSIVE LOSS |  | (100) | 181 | 268
BALANCE |  | 91 | 191 | 10
Net unrealized gain (loss) on retirement plan [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
BALANCE | [2] | (17,167) | (16,198) | (11,169)
Other comprehensive gain (loss) before reclassification | [2] | (21,464) | (3,492) | (6,690)
Reclassification to net income | [1],[2] | 2,556 | 2,523 | 1,661
TOTAL OTHER COMPREHENSIVE LOSS | [2] | (18,908) | (969) | (5,029)
BALANCE | [2] | (36,075) | (17,167) | (16,198)
Change in cumulative foreign currency translation adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
BALANCE |  | (21) | (46) | (37)
Other comprehensive gain (loss) before reclassification |  | (14) |  | (9)
Reclassification to net income | [1] |  | 25 |
TOTAL OTHER COMPREHENSIVE LOSS |  | (14) | 25 | (9)
BALANCE |  | (35) | (21) | (46)
Accumulated Other Comprehensive Loss [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
BALANCE |  | (16,997) | (16,234) | (11,464)
TOTAL OTHER COMPREHENSIVE LOSS |  | (19,022) | (763) | (4,770)
BALANCE |  | $ (36,019) | $ (16,997) | $ (16,234)
[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.
[2] | Refer to Note 15: Employee Retirement Plans

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