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EMPLOYEE RETIREMENT PLANS - Schedule of change in benefit obligation and plan assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Change in projected benefit obligation |  |
Service cost | $ 383 | $ 463
Interest cost | 2,012 | 2,460
Amounts recognized in the consolidated balance sheets consist of: |  |
Long-term pension liability | (33,534) | (27,523)
Amounts recognized in accumulated other comprehensive loss consist of: |  |
Net amount recognized | 21,955 | 17,503
Plan Assets [Member] |  |
Change in plan assets |  |
Fair value of plan assets, beginning of year | 41,036 |
Fair value of plan assets, end of year | 43,144 | 41,036
Defined Benefit Pension Plan [Member] |  |
Change in projected benefit obligation |  |
Projected benefit obligation, beginning of year | 50,552 | 45,010
Service cost | 383 | 463
Interest cost | 1,450 | 1,801
Actuarial loss | 6,067 | 5,660
Benefits paid | (2,426) | (2,382)
Projected benefit obligation, end of year | 56,026 | 50,552
Change in plan assets |  |
Actual return on plan assets | 4,917 | 6,528
Administrative expenses | (383) | (463)
Contributions | 0 | 0
Benefits paid | (2,426) | (2,382)
Funded status of plan | (12,882) | (9,516)
Amounts recognized in the consolidated balance sheets consist of: |  |
Accrued liabilities - other | 0 | 0
Long-term pension liability | (12,882) | (9,516)
Net amount recognized | (12,882) | (9,516)
Amounts recognized in accumulated other comprehensive loss consist of: |  |
Accumulated loss, net of income tax benefit of $5,435, $4,478, $2,275 and $1,684, respectively | 15,468 | 12,745
Prior service cost (credit) net of income tax liability of $0, $0, $4 and ($12), respectively | 0 | 0
Net amount recognized | 15,468 | 12,745
Defined Benefit Pension Plan [Member] | Plan Assets [Member] |  |
Change in plan assets |  |
Fair value of plan assets, beginning of year | 41,036 | 37,353
Fair value of plan assets, end of year | 43,144 | 41,036
Supplemental Pension Plan [Member] |  |
Change in projected benefit obligation |  |
Projected benefit obligation, beginning of year | 18,460 | 15,891
Service cost | 0 | 0
Interest cost | 562 | 659
Actuarial loss | 2,485 | 2,355
Benefits paid | (382) | (445)
Projected benefit obligation, end of year | 21,125 | 18,460
Change in plan assets |  |
Actual return on plan assets | 0 | 0
Administrative expenses | 0 | 0
Contributions | 382 | 445
Benefits paid | (382) | (445)
Funded status of plan | (21,125) | (18,460)
Amounts recognized in the consolidated balance sheets consist of: |  |
Accrued liabilities - other | (473) | (453)
Long-term pension liability | (20,652) | (18,007)
Net amount recognized | (21,125) | (18,460)
Amounts recognized in accumulated other comprehensive loss consist of: |  |
Accumulated loss, net of income tax benefit of $5,435, $4,478, $2,275 and $1,684, respectively | 6,475 | 4,792
Prior service cost (credit) net of income tax liability of $0, $0, $4 and ($12), respectively | 12 | (34)
Net amount recognized | 6,487 | 4,758
Supplemental Pension Plan [Member] | Plan Assets [Member] |  |
Change in plan assets |  |
Fair value of plan assets, beginning of year | 0 | 0
Fair value of plan assets, end of year | $ 0 | $ 0

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- Definition Amount, after tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: 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=121641772&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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