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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Settlement charges (1) |  |  |  |  | $ 758
Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Service cost |  | $ 701 | $ 832 | $ 1,429 | 1,683
Interest cost |  | 922 | 937 | 1,858 | 1,907
Expected return on plan assets |  | (1,106) | (1,266) | (2,230) | (2,540)
Amortization of prior service cost |  | 15 | 0 | 31 | 1
Amortization of net loss |  | 572 | 555 | 1,157 | 1,130
Settlement charges (1) | [1] | 0 | 0 | 0 | 0
Defined benefit plans |  | 1,104 | 1,058 | 2,245 | 2,181
Multi-employer plans |  | 243 | 234 | 490 | 461
Defined contribution plans |  | 424 | 1,036 | 923 | 1,865
Total pension cost |  | 1,771 | 2,328 | 3,658 | 4,507
Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Service cost |  | 35 | 35 | 70 | 70
Interest cost |  | 4,653 | 4,493 | 9,306 | 8,987
Expected return on plan assets |  | (6,245) | (6,915) | (12,490) | (13,831)
Amortization of prior service cost |  | 0 | 0 | 0 | 0
Amortization of net loss |  | 414 | 384 | 827 | 768
Settlement charges (1) | [1] | 0 | 0 | 0 | 758
Defined benefit plans |  | (1,143) | (2,003) | (2,287) | (3,248)
Multi-employer plans |  | 0 | 0 | 0 | 0
Defined contribution plans |  | 5,791 | 5,610 | 11,699 | 11,504
Total pension cost |  | $ 4,648 | $ 3,607 | $ 9,412 | 8,256
Americas Welding |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Settlement charges (1) |  |  |  |  | $ 758
[1] | Pension settlement charges resulting from lump sum pension payments in the six months ended June 30, 2018.

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