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Pension and Other Postretirement Employee Benefits | 9 Months Ended
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Sep. 30, 2019
General Discussion Of Pension And Other Postretirement Benefits [Abstract] |
Pension and Other Postretirement Employee Benefits | NOTE 15. PENSION AND OTHER POSTRETIREMENT EMPLOYEE BENEFITS The following tables detail the components of net periodic cost (benefit) of our pension plans and other postretirement employee benefits (OPEB):
|  | Three Months Ended September 30, |
|  | Pension |  |  | OPEB |
(in thousands) |  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Service cost |  | $ | 1,942 |  |  | $ | 2,181 |  |  | $ | 93 |  |  | $ | 99 |
Interest cost |  |  | 4,618 |  |  |  | 4,344 |  |  |  | 397 |  |  |  | 391 |
Expected return on plan assets |  |  | (5,548 | ) |  |  | (5,095 | ) |  |  | — |  |  |  | — |
Amortization of prior service cost (credit) |  |  | 52 |  |  |  | 46 |  |  |  | (2,211 | ) |  |  | (2,219 | )
Amortization of actuarial loss |  |  | 3,374 |  |  |  | 4,148 |  |  |  | 253 |  |  |  | 327 |
Net periodic cost (benefit) |  | $ | 4,438 |  |  | $ | 5,624 |  |  | $ | (1,468 | ) |  | $ | (1,402 | )
|  | Nine Months Ended September 30, |
|  | Pension |  |  | OPEB |
(Dollars in thousands) |  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Service cost |  | $ | 5,825 |  |  | $ | 6,272 |  |  | $ | 278 |  |  | $ | 242 |
Interest cost |  |  | 13,849 |  |  |  | 12,648 |  |  |  | 1,191 |  |  |  | 1,091 |
Expected return on plan assets |  |  | (16,643 | ) |  |  | (14,938 | ) |  |  | — |  |  |  | — |
Amortization of prior service cost (credit) |  |  | 158 |  |  |  | 139 |  |  |  | (6,633 | ) |  |  | (6,658 | )
Amortization of actuarial loss |  |  | 10,122 |  |  |  | 12,442 |  |  |  | 760 |  |  |  | 983 |
Net periodic cost (benefit) |  | $ | 13,311 |  |  | $ | 16,563 |  |  | $ | (4,404 | ) |  | $ | (4,342 | )
During the nine months ended September 30, 2019 and 2018, funding of pension and other postretirement employee benefit plans was $4.6 million and $56.0 million, respectively. $52.1 million of qualified pension benefit contributions during the nine months ended September 30, 2018 were designated for and included as deductions on our 2017 income tax return which allowed us to deduct those payments at a higher rate.

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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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