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ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
BALANCE |  | $ 952,468 | $ 846,697 | $ 912,714 | $ 811,449
Other comprehensive gain (loss) before reclassification |  |  |  | (101) | 938
Reclassification to net income | [1] |  |  | 2,348 | 1,278
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) |  | 1,237 | (244) | 2,247 | 2,216
BALANCE |  | 991,616 | 839,770 | 991,616 | 839,770
Unrealized gain (loss) on available-for-sale securities [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
BALANCE |  |  |  | 91 | 191
Other comprehensive gain (loss) before reclassification |  |  |  | (32) | 968
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  | (32) | 968
BALANCE |  | 59 | 1,159 | 59 | 1,159
Net unrealized gain (loss) on retirement plan [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
BALANCE | [2] |  |  | (36,075) | (17,167)
Reclassification to net income | [1],[2] |  |  | 2,348 | 1,278
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) | [2] |  |  | 2,348 | 1,278
BALANCE | [2] | (33,727) | (15,889) | (33,727) | (15,889)
Change in cumulative foreign currency translation adjustment [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
BALANCE |  |  |  | (35) | (21)
Other comprehensive gain (loss) before reclassification |  |  |  | (69) | (30)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) |  |  |  | (69) | (30)
BALANCE |  | (104) | (51) | (104) | (51)
Accumulated Other Comprehensive Loss [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
BALANCE |  | (35,009) | (14,537) | (36,019) | (16,997)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS) |  | 1,237 | (244) | 2,247 | 2,216
BALANCE |  | $ (33,772) | $ (14,781) | $ (33,772) | $ (14,781)
[1] | The Company reclassified amortization of prior service cost and actuarial loss for its retirement plan from accumulated other comprehensive loss to net income of $2.3 million and $1.3 million for the six months ended June 30, 2021 and 2020.
[2] | Refer to Note 14: Supplemental Executive Retirement Plan

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