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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
BALANCE |  | $ 751,033 | $ 650,681 | $ 690,506 | $ 659,054
Other comprehensive gain (loss) before reclassification |  |  |  | 212 | 204
Reclassification to net income | [1] |  |  | 1,903 | 1,266
TOTAL OTHER COMPREHENSIVE INCOME |  | 686 | 457 | 2,115 | 1,470
BALANCE |  | 786,567 | 675,507 | 786,567 | 675,507
Unrealized gain (loss) on available-for-sale debt securities [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
BALANCE |  |  |  | 10 | (258)
Other comprehensive gain (loss) before reclassification |  |  |  | 178 | 214
TOTAL OTHER COMPREHENSIVE INCOME |  |  |  | 178 | 214
BALANCE |  | 188 | (44) | 188 | (44)
Net unrealized gain (loss) on retirement plan [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
BALANCE | [2] |  |  | (16,198) | (11,169)
Reclassification to net income | [1],[2] |  |  | 1,903 | 1,266
TOTAL OTHER COMPREHENSIVE INCOME | [2] |  |  | 1,903 | 1,266
BALANCE | [2] | (14,295) | (9,903) | (14,295) | (9,903)
Change in cumulative foreign currency translation adjustment [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
BALANCE |  |  |  | (46) | (37)
Other comprehensive gain (loss) before reclassification |  |  |  | 34 | (10)
TOTAL OTHER COMPREHENSIVE INCOME |  |  |  | 34 | (10)
BALANCE |  | (12) | (47) | (12) | (47)
Accumulated Other Comprehensive Loss [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
BALANCE |  | (14,805) | (10,451) | (16,234) | (11,464)
TOTAL OTHER COMPREHENSIVE INCOME |  | 686 | 457 | 2,115 | 1,470
BALANCE |  | $ (14,119) | $ (9,994) | $ (14,119) | $ (9,994)
[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 and $1.3 million for the nine months ended September 30, 2019 and 2018, respectively.
[2] | Refer to Note 14: Supplemental Executive Retirement Plan

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