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RETIREMENT ANNUITY AND GUARANTEED CONTINUOUS EMPLOYMENT PLANS (Obligations and Funded Status) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Change in plan assets |  |  |  |
Balance at the beginning of year |  | $ 695,224 |  |
Balance at the end of year |  | 735,082 | $ 695,224 |
United States |  |  |  |
Change in benefit obligations |  |  |  |
Benefit obligations at beginning of year |  | 492,511 | 438,945 |
Service cost |  | 156 | 140 | $ 139
Interest cost |  | 14,670 | 18,610 | 18,084
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant |  | 0 | 0 |
Acquisitions |  | 0 | 0 |
Actuarial (gain) loss |  | 100,346 | 58,842 |
Defined Benefit Plan, Benefit Obligation, Benefits Paid |  | (10,105) | (24,026) |
Settlement/curtailment | [1] | (39,632) | 0 |
Currency translation |  | 0 | 0 |
Benefit obligations at end of year |  | $ 557,946 | $ 492,511 | 438,945
Discount rate |  | 2.20% | 3.40% |
Change in plan assets |  |  |  |
Balance at the beginning of year |  | $ 589,551 | $ 512,078 |
Actual return on plan assets |  | 72,596 | 100,744 |
Employer contributions |  | 0 | 0 |
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant |  | 0 | 0 |
Acquisitions & other adjustments |  | 0 | 0 |
Benefits paid |  | (8,875) | (23,271) |
Settlement | [1] | (35,248) | 0 |
Currency translation |  | 0 | 0 |
Balance at the end of year |  | 618,024 | 589,551 | 512,078
Net amount recognized |  |  |  |
Funded status at end of year |  | 60,078 | 97,040 |
Unrecognized actuarial net loss |  | 108,873 | 67,050 |
Unrecognized prior service cost |  | 0 | 0 |
Unrecognized transition assets, net |  | 0 | 0 |
Net amount recognized in the balance sheets |  | 168,951 | 164,090 |
Foreign Plan [Member] |  |  |  |
Change in benefit obligations |  |  |  |
Benefit obligations at beginning of year |  | 176,858 | 168,811 |
Service cost |  | 3,140 | 2,908 | 3,252
Interest cost |  | 2,755 | 3,739 | 3,703
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant |  | 142 | 153 |
Acquisitions |  | 11 | (1,864) |
Actuarial (gain) loss |  | 7,161 | 10,653 |
Defined Benefit Plan, Benefit Obligation, Benefits Paid |  | (7,064) | (8,961) |
Settlement/curtailment | [1] | (2,701) | (1,256) |
Currency translation |  | 9,839 | 2,675 |
Benefit obligations at end of year |  | $ 190,141 | $ 176,858 | 168,811
Discount rate |  | 1.30% | 1.70% |
Change in plan assets |  |  |  |
Balance at the beginning of year |  | $ 105,673 | $ 100,187 |
Actual return on plan assets |  | 8,403 | 9,743 |
Employer contributions |  | 2,818 | 2,210 |
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant |  | 142 | 153 |
Acquisitions & other adjustments |  |  | (2,651) |
Benefits paid |  | (4,403) | (6,120) |
Settlement | [1] | (633) | (920) |
Currency translation |  | 5,058 | 3,071 |
Balance at the end of year |  | 117,058 | 105,673 | $ 100,187
Net amount recognized |  |  |  |
Funded status at end of year |  | (73,083) | (71,185) |
Unrecognized actuarial net loss |  | 28,637 | 28,543 |
Unrecognized prior service cost |  | 389 | 457 |
Unrecognized transition assets, net |  | 27 | 30 |
Net amount recognized in the balance sheets |  | $ (44,030) | $ (42,155) |
[1] | Actuarial losses in 2020 were primarily the result of a decrease in the Company’s U.S. pension plan discount rate from 3.4% in 2019 to 2.2% in 2020.

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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + 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 (h)(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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 + Details
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- Definition Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. + 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)(8) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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