| Schedule of Consolidated Net Periodic Benefit Costs |
Net periodic benefit expense for the three and six months ended June 30, 2018 and 2019 was as follows (in thousands): | | | | | | | | | | | | | | | | | | Three Months Ended | | Three Months Ended | | June 30, 2018 | | June 30, 2019 | | Pension Benefits | | Other Postretirement Benefits | | Pension Benefits | | Other Postretirement Benefits | Components of net periodic benefit costs: | | | | | | | | Service cost | $ | 6,269 |
| | $ | 51 |
| | $ | 6,358 |
| | $ | 43 |
| Interest cost | 2,795 |
| | 102 |
| | 3,110 |
| | 135 |
| Expected return on plan assets | (3,024 | ) | | — |
| | (2,317 | ) | | — |
| Amortization of prior service credit | (46 | ) | | — |
| | (45 | ) | | — |
| Amortization of actuarial loss | 1,569 |
| | 134 |
| | 1,508 |
| | 117 |
| Settlement cost | — |
| | — |
| | 2,060 |
| | — |
| Net periodic benefit cost | $ | 7,563 |
| | $ | 287 |
| | $ | 10,674 |
| | $ | 295 |
|
| | | | | | | | | | | | | | | | | | Six Months Ended | | Six Months Ended | | June 30, 2018 | | June 30, 2019 | | Pension Benefits | | Other Postretirement Benefits | | Pension Benefits | | Other Postretirement Benefits | Components of net periodic benefit costs: | | | | | | | | Service cost | $ | 21,969 |
| | $ | 116 |
| | $ | 12,885 |
| | $ | 97 |
| Interest cost | 9,238 |
| | 208 |
| | 6,110 |
| | 254 |
| Expected return on plan assets | (6,002 | ) | | — |
| | (4,691 | ) | | — |
| Amortization of prior service credit | (91 | ) | | — |
| | (90 | ) | | — |
| Amortization of actuarial loss | 6,523 |
| | 294 |
| | 2,785 |
| | 188 |
| Settlement cost | — |
| | — |
| | 2,060 |
| | — |
| Net periodic benefit cost | $ | 31,637 |
| | $ | 618 |
| | $ | 19,059 |
| | $ | 539 |
| | | | | | | | |
The service component of our net periodic benefit costs is presented in operating expense and G&A expense, and the non-service components are presented in other (income) expense in our consolidated statements of income.
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| Schedule of Amounts Recognized in Other Comprehensive Loss |
The changes in accumulated other comprehensive loss (“AOCL”) related to employee benefit plan assets and benefit obligations for the three and six months ended June 30, 2018 and 2019 were as follows (in thousands): | | | | | | | | | | | | | | | | | | | | Three Months Ended | | Three Months Ended | | | June 30, 2018 | | June 30, 2019 | Gains (Losses) Included in AOCL | | Pension Benefits | | Other Postretirement Benefits | | Pension Benefits | | Other Postretirement Benefits | Beginning balance | | $ | (98,261 | ) | | $ | (6,437 | ) | | $ | (87,370 | ) | | $ | (5,338 | ) | Net actuarial gain (loss) | | 386 |
| | 267 |
| | (10,029 | ) | | (884 | ) | Amortization of prior service credit | | (46 | ) | | — |
| | (45 | ) | | — |
| Amortization of actuarial loss | | 1,569 |
| | 134 |
| | 1,508 |
| | 117 |
| Settlement cost | | — |
| | — |
| | 2,060 |
| | — |
| Ending balance | | $ | (96,352 | ) | | $ | (6,036 | ) | | $ | (93,876 | ) | | $ | (6,105 | ) |
| | | | | | | | | | | | | | | | | | | | Six Months Ended | | Six Months Ended | | | June 30, 2018 | | June 30, 2019 | Gains (Losses) Included in AOCL | | Pension Benefits | | Other Postretirement Benefits | | Pension Benefits | | Other Postretirement Benefits | Beginning balance | | $ | (97,226 | ) | | $ | (6,597 | ) | | $ | (88,602 | ) | | $ | (5,409 | ) | Net actuarial gain (loss) | | (5,558 | ) | | 267 |
| | (10,029 | ) | | (884 | ) | Amortization of prior service credit | | (91 | ) | | — |
| | (90 | ) | | — |
| Amortization of actuarial loss | | 6,523 |
| | 294 |
| | 2,785 |
| | 188 |
| Settlement cost | | — |
| | — |
| | 2,060 |
| | — |
| Ending balance | | $ | (96,352 | ) | | $ | (6,036 | ) | | $ | (93,876 | ) | | $ | (6,105 | ) | | | | | | | | | |
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