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RETIREMENT PLANS | 9 Months Ended
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Sep. 30, 2019
RETIREMENT PLANS |
RETIREMENT PLANS | 11. RETIREMENT PLANS ​ The Company has noncontributory defined benefit pension plans for eligible employees in its International Telecom segment who meet certain eligibility criteria. The Company also has a noncontributory defined medical, dental, vision, and life benefit plan for eligible employees in its International Telecom segment who meet certain eligibility criteria. The Company recorded the net periodic benefit cost identified below (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​
​ |  | September 30, 2019 |  | September 30, 2018 | ​
​ | ​ | Pension benefits | ​ | Postretirement benefits | ​ | Pension benefits | ​ | Postretirement benefits | ​
Operating expense | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | $ | 447 | ​ | $ | 37 | ​ | $ | 448 | ​ | $ | 37 | ​
Non-operating expense | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest cost | ​ | ​ | 841 | ​ | ​ | 40 | ​ | ​ | 820 | ​ | ​ | 40 | ​
Expected return on plan assets | ​ |  | (1,263) | ​ |  | — | ​ |  | (1,209) | ​ |  | — | ​
Actuarial gain/ loss | ​ | ​ | 7 | ​ | ​ | (17) | ​ | ​ | 30 | ​ | ​ | (17) | ​
Net periodic pension expense | ​ | $ | 32 | ​ | $ | 60 | ​ | $ | 89 | ​ | $ | 60 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine months ended | ​
​ | ​ | September 30, 2019 |  | September 30, 2018 | ​
​ | ​ | Pension benefits | ​ | Postretirement benefits | ​ | Pension benefits | ​ | Postretirement benefits | ​
Operating expense | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | $ | 1,342 | ​ | $ | 111 | ​ | $ | 1,345 | ​ | $ | 111 | ​
Non-operating expense | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest cost | ​ | ​ | 2,524 | ​ | ​ | 120 | ​ | ​ | 2,459 | ​ | ​ | 120 | ​
Expected return on plan assets | ​ |  | (3,790) | ​ |  | — | ​ |  | (3,627) | ​ |  | — | ​
Actuarial gain/ loss | ​ | ​ | 22 | ​ | ​ | (51) | ​ | ​ | 91 | ​ | ​ | (51) | ​
Net periodic pension expense | ​ | $ | 98 | ​ | $ | 180 | ​ | $ | 268 | ​ | $ | 180 | ​
​ The Company is not required to make contributions to its pension and postretirement benefit plans. However, the Company periodically evaluates whether to make discretionary contributions. The Company contributed $0.3 million and $2.1 million during the nine months ended September 30, 2019 and 2018, respectively.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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