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RETIREMENT AND DEFERRED COMPENSATION PLANS | 9 Months Ended
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Sep. 30, 2020
Retirement Benefits [Abstract] |
RETIREMENT AND DEFERRED COMPENSATION PLANS | RETIREMENT AND DEFERRED COMPENSATION PLANS Components of Net Periodic Benefit Cost:
​ | Domestic Plans |  | Foreign Plans
Three Months Ended September 30, | 2020 |  | 2019 |  | 2020 |  | 2019
Service cost | $ | 3,570 |  |  | $ | 2,772 |  |  | $ | 1,867 |  |  | $ | 1,429 |
Interest cost | 1,761 |  |  | 1,845 |  |  | 360 |  |  | 491 |
Expected return on plan assets | (3,062) |  |  | (3,095) |  |  | (671) |  |  | (581) |
Amortization of net loss | 1,422 |  |  | 490 |  |  | 544 |  |  | 356 |
Amortization of prior service cost | — |  |  | — |  |  | 101 |  |  | 111 |
Net periodic benefit cost | $ | 3,691 |  |  | $ | 2,012 |  |  | $ | 2,201 |  |  | $ | 1,806 |
​
​ | Domestic Plans |  | Foreign Plans
Nine Months Ended September 30, | 2020 |  | 2019 |  | 2020 |  | 2019
Service cost | $ | 10,709 |  |  | $ | 8,320 |  |  | $ | 5,402 |  |  | $ | 4,334 |
Interest cost | 5,284 |  |  | 5,536 |  |  | 1,040 |  |  | 1,487 |
Expected return on plan assets | (9,186) |  |  | (9,284) |  |  | (1,936) |  |  | (1,759) |
Amortization of net loss | 4,264 |  |  | 1,468 |  |  | 1,572 |  |  | 1,078 |
Amortization of prior service cost | — |  |  | — |  |  | 293 |  |  | 337 |
Net periodic benefit cost | $ | 11,071 |  |  | $ | 6,040 |  |  | $ | 6,371 |  |  | $ | 5,477 |
​ The components of net periodic benefit cost, other than the service cost component, are included in the line “Miscellaneous, net” in the income statement. EMPLOYER CONTRIBUTIONS Although we currently have no minimum funding requirements for our domestic and foreign plans, we contributed $204 thousand to our ongoing domestic supplemental employee retirement plan (SERP) annuity contracts during the nine months ended September 30, 2020 and do not expect additional significant contributions during 2020. We have contributed approximately $1.6 million to our foreign defined benefit plans during the nine months ended September 30, 2020 and do not expect additional significant contributions during 2020.

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