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ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
BALANCE |  | $ 839,770 | $ 751,033 | $ 811,449 | $ 690,506
Other comprehensive gain (loss) before reclassification |  |  |  | 313 | 212
Reclassification to net income | [1] |  |  | 1,917 | 1,903
TOTAL OTHER COMPREHENSIVE INCOME |  | 14 | 686 | 2,230 | 2,115
BALANCE |  | 879,636 | 786,567 | 879,636 | 786,567
Unrealized gain (loss) on available-for-sale debt securities [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
BALANCE |  |  |  | 191 | 10
Other comprehensive gain (loss) before reclassification |  |  |  | 342 | 178
TOTAL OTHER COMPREHENSIVE INCOME |  |  |  | 342 | 178
BALANCE |  | 533 | 188 | 533 | 188
Net unrealized gain (loss) on retirement plan [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
BALANCE | [2] |  |  | (17,167) | (16,198)
Reclassification to net income | [1],[2] |  |  | 1,917 | 1,903
TOTAL OTHER COMPREHENSIVE INCOME | [2] |  |  | 1,917 | 1,903
BALANCE | [2] | (15,250) | (14,295) | (15,250) | (14,295)
Change in cumulative foreign currency translation adjustment [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
BALANCE |  |  |  | (21) | (46)
Other comprehensive gain (loss) before reclassification |  |  |  | (29) | 34
TOTAL OTHER COMPREHENSIVE INCOME |  |  |  | (29) | 34
BALANCE |  | (50) | (12) | (50) | (12)
Accumulated Other Comprehensive Loss [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
BALANCE |  | (14,781) | (14,805) | (16,997) | (16,234)
TOTAL OTHER COMPREHENSIVE INCOME |  | 14 | 686 | 2,230 | 2,115
BALANCE |  | $ (14,767) | $ (14,119) | $ (14,767) | $ (14,119)
[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 $1.9 million for both nine-month periods ended September 30, 2020 and 2019.
[2] | Refer to Note 14: Supplemental Executive Retirement Plan

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