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ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
BALANCE |  | $ 912,714 | $ 811,449 | $ 690,506
Other comprehensive gain (loss) before reclassification |  | 13,348 | (21,578) | (3,311)
Plan amendment cost |  | (283) |  |
Reclassification to net income | [1] | 4,719 | 2,556 | 2,548
Other comprehensive loss |  | 17,784 | (19,022) | (763)
BALANCE |  | 1,099,914 | 912,714 | 811,449
Unrealized gain (loss) on available-for-sale securities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
BALANCE |  | 91 | 191 | 10
Other comprehensive gain (loss) before reclassification |  | (233) | (100) | 181
Plan amendment cost |  | 0 |  |
Reclassification to net income | [1] | 0 | 0 | 0
Other comprehensive loss |  | (233) | (100) | 181
BALANCE |  | (142) | 91 | 191
Net unrealized gain (loss) on retirement plan [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
BALANCE | [2] | (36,075) | (17,167) | (16,198)
Other comprehensive gain (loss) before reclassification | [2] | 13,620 | (21,464) | (3,492)
Plan amendment cost | [2] | (283) |  |
Reclassification to net income | [1],[2] | 4,719 | 2,556 | 2,523
Other comprehensive loss | [2] | 18,056 | (18,908) | (969)
BALANCE | [2] | (18,019) | (36,075) | (17,167)
Change in cumulative foreign currency translation adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
BALANCE |  | (35) | (21) | (46)
Other comprehensive gain (loss) before reclassification |  | (39) | (14) | (0)
Plan amendment cost |  | 0 |  |
Reclassification to net income | [1] | 0 | 0 | 25
Other comprehensive loss |  | (39) | (14) | 25
BALANCE |  | (74) | (35) | (21)
Accumulated Other Comprehensive Loss [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
BALANCE |  | (36,019) | (16,997) | (16,234)
Other comprehensive loss |  | 17,784 | (19,022) | (763)
BALANCE |  | $ (18,235) | $ (36,019) | $ (16,997)
[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 $4.7 million, $2.6 million and $2.5 million for the years ended December 31, 2021, 2020 and 2019, respectively.
[2] | Refer to Note 17: Employee Retirement Plans

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- Definition Amount of increase (decrease) in net periodic benefit cost from effect of change in substantive term of existing defined benefit plan or initiation of new defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (r) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124431353&loc=SL124442411-227067 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=124507222&loc=d3e1436-108581 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=124431353&loc=SL124442407-227067 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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