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EMPLOYEE RETIREMENT PLANS AND POSTRETIREMENT BENEFITS (Tables) | 12 Months Ended
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Dec. 31, 2020
EMPLOYEE RETIREMENT PLANS AND POSTRETIREMENT BENEFITS |
Changes in projected benefit obligations and plan assets | The Company’s projected benefit obligation and plan assets for defined benefit pension plans and the related assumptions used to determine the related liabilities are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2020 |  | 2019
Projected benefit obligation, beginning of year | ​ | $ | 83,262 | ​ | $ | 33,178
Acquisition | ​ |  | — | ​ |  | 48,350
Service cost | ​ |  | 1,068 | ​ |  | 272
Interest cost | ​ |  | 1,716 | ​ |  | 1,211
Actuarial (gain) loss | ​ |  | 7,591 | ​ |  | (193)
Benefits paid | ​ |  | (1,199) | ​ |  | (1,779)
Translation adjustment | ​ |  | 5,302 | ​ |  | 2,223
Projected benefit obligation, end of year | ​ | ​ | 97,740 | ​ | ​ | 83,262
​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value of plan assets, beginning of year | ​ | ​ | 14,903 | ​ | ​ | 13,433
Acquisitions | ​ |  | — | ​ |  | 102
Actual return on plan assets | ​ |  | 682 | ​ |  | 380
Contributions | ​ |  | 1,827 | ​ |  | 644
Benefits paid | ​ |  | (993) | ​ |  | (1,176)
Actuarial gain | ​ |  | 180 | ​ |  | 1,064
Translation adjustment | ​ |  | 694 | ​ |  | 456
Fair value of plan assets, end of year | ​ | ​ | 17,293 | ​ | ​ | 14,903
Funded status of plan | ​ | $ | (80,447) | ​ | $ | (68,359)
Schedule of net periodic pension benefit costs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2020 |  | 2019 |  | 2018
Service cost | ​ | $ | 1,068 | ​ | $ | 272 | ​ | $ | 841
Interest cost | ​ | ​ | 1,716 | ​ | ​ | 1,211 | ​ | ​ | 802
Expected return on plan assets | ​ |  | (683) | ​ |  | (615) | ​ |  | (665)
Amortization of actuarial gains and losses | ​ |  | 459 | ​ |  | 411 | ​ |  | 478
Net periodic pension cost | ​ | $ | 2,560 | ​ | $ | 1,279 | ​ | $ | 1,456
Schedule of assumptions used in determination of net period pension cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31, |
​ |  | 2020 |  | 2019 |  | 2018 |
Discount rate |  | 1.8 | % | 2.7 | % | 2.8 | %
Expected long-term return on plan assets |  | 3.7 | % | 4.6 | % | 4.8 | %
Schedule of fair value qualified pension plan assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Multi-Asset Fund | ​ | $ | — | ​ | $ | 5,149 | ​ | $ | — | ​ | $ | 5,149
Diversified Growth Fund | ​ |  | — | ​ |  | 5,134 | ​ |  | — | ​ |  | 5,134
Corporate Bonds | ​ |  | — | ​ |  | 4,906 | ​ |  | — | ​ |  | 4,906
Insurance Contracts | ​ | ​ | — | ​ |  | — | ​ |  | 1,109 | ​ |  | 1,109
Cash | ​ |  | 995 | ​ |  | — | ​ |  | — | ​ |  | 995
Total | ​ | $ | 995 | ​ | $ | 15,189 | ​ | $ | 1,109 | ​ | $ | 17,293
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Multi-Asset Fund | ​ | $ | — | ​ | $ | 4,825 | ​ | $ | — | ​ | $ | 4,825
Diversified Growth Fund | ​ |  | — | ​ |  | 4,855 | ​ |  | — | ​ |  | 4,855
Index-Linked Gilts | ​ |  | — | ​ |  | 1,934 | ​ |  | — | ​ |  | 1,934
Corporate Bonds | ​ |  | — | ​ |  | 2,090 | ​ |  | — | ​ |  | 2,090
Insurance Contracts | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,045 | ​ | ​ | 1,045
Cash | ​ |  | 154 | ​ |  | — | ​ |  | — | ​ |  | 154
Total | ​ | $ | 154 | ​ | $ | 13,704 | ​ | $ | 1,045 | ​ | $ | 14,903
Schedule of expected future benefit payments under defined benefit pension plans | Expected future payments under defined benefit pension plans, based on foreign exchange rates as of December 31, 2020, are as follows: ​
​ | ​ | ​ | ​
Expected Future Benefit Payments | ​ | ​ | ​
2021 |  | $ | 2,255
2022 | ​ | ​ | 1,972
2023 | ​ | ​ | 2,184
2024 | ​ | ​ | 2,891
2025 | ​ | ​ | 2,301
2026 - 2030 | ​ | ​ | 49,098

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans including the fair value of each major category of plan assets and the level within the fair value hierarchy in which the fair value measurements fall. + References No definition available. + Details
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- Definition Tabular disclosure of the change in the benefit obligation, fair value of plan assets, and funded status of pension plans or other employee benefit plans. + 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 (a)(b)(c) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate. + 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 (k) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + 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 (f) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + 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 (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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