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PENSIONS (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) defined_benefit_plan | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Defined benefit schemes: |  |  |
Defined contribution scheme, charge to net income | $ 2,100 | $ 2,400 | $ 1,900
Number of defined benefit schemes | defined_benefit_plan | 2 |  |
Expected amortization of gain (loss), next fiscal year | $ (800) | (800) |
Accumulated benefit obligation | 53,400 | 49,200 |
Employer contributions | 2,900 | 3,411 |
Accumulated other comprehensive income (loss), gain (loss), before tax | 15,900 | 12,200 |
Other comprehensive income, tax on actuarial loss | $ 600 | $ 500 | $ 400

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount, before 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://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 Reference 2: 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 + Details
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