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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Settlement charges (1) |  |  | $ 4,232 |  | $ 4,990
Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Service cost |  | $ 35 | 35 | $ 105 | 105
Interest cost |  | 4,652 | 4,574 | 13,958 | 13,561
Expected return on plan assets |  | (6,245) | (6,450) | (18,735) | (20,281)
Amortization of prior service cost |  | 0 | 0 | 0 | 0
Amortization of net loss |  | 413 | 355 | 1,240 | 1,123
Settlement charges (1) | [1] | 0 | 4,232 | 0 | 4,990
Defined benefit plans |  | (1,145) | 2,746 | (3,432) | (502)
Multi-employer plans |  | 0 | 0 | 0 | 0
Defined contribution plans |  | 5,506 | 5,712 | 17,205 | 17,216
Total pension cost |  | 4,361 | 8,458 | 13,773 | 16,714
Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Service cost |  | 697 | 796 | 2,126 | 2,479
Interest cost |  | 903 | 867 | 2,761 | 2,774
Expected return on plan assets |  | (1,087) | (1,174) | (3,317) | (3,714)
Amortization of prior service cost |  | 16 | 0 | 47 | 1
Amortization of net loss |  | 720 | 546 | 1,877 | 1,676
Settlement charges (1) | [1] | 0 | 0 | 0 | 0
Defined benefit plans |  | 1,249 | 1,035 | 3,494 | 3,216
Multi-employer plans |  | 227 | 226 | 717 | 687
Defined contribution plans |  | 692 | 813 | 1,615 | 2,678
Total pension cost |  | $ 2,168 | 2,074 | $ 5,826 | 6,581
Americas Welding |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Settlement charges (1) |  |  | $ 4,232 |  | $ 4,990
[1] | Pension settlement charges resulting from lump sum pension payments in the three and nine months ended September 30, 2018.

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