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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Service cost |  | $ 39 | $ 35 | $ 117 | $ 105
Interest cost |  | 3,346 | 4,652 | 11,447 | 13,958
Expected return on plan assets |  | (6,009) | (6,245) | (17,431) | (18,735)
Amortization of prior service cost |  | 0 | 0 | 0 | 0
Amortization of net loss |  | 459 | 413 | 865 | 1,240
Settlement charges (1) | [1] | 3,188 | 0 | 6,522 | 0
Defined benefit plans |  | 1,023 | (1,145) | 1,520 | (3,432)
Multi-employer plans |  | 0 | 0 | 0 | 0
Defined contribution plans |  | 4,945 | 5,506 | 15,322 | 17,205
Total pension cost |  | 5,968 | 4,361 | 16,842 | 13,773
Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Service cost |  | 718 | 697 | 2,216 | 2,126
Interest cost |  | 673 | 903 | 2,052 | 2,761
Expected return on plan assets |  | (1,076) | (1,087) | (3,097) | (3,317)
Amortization of prior service cost |  | 15 | 16 | 46 | 47
Amortization of net loss |  | 468 | 720 | 1,563 | 1,877
Settlement charges (1) | [1] | 0 | 0 | 0 | 0
Defined benefit plans |  | 798 | 1,249 | 2,780 | 3,494
Multi-employer plans |  | 274 | 227 | 800 | 717
Defined contribution plans |  | 931 | 692 | 2,406 | 1,615
Total pension cost |  | 2,003 | $ 2,168 | 5,986 | $ 5,826
Americas Welding |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Settlement charges (1) |  | $ 3,188 |  | $ 6,522 |
[1] | Pension settlement charges resulting from lump sum pension payments in the three and nine months ended September 30, 2020.

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