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Pension and other post-retirement benefits (Tables) | 6 Months Ended
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Jun. 30, 2021
Retirement Benefits [Abstract] |
Components of Net Benefit Costs For Pension Plans and OPEB Recorded as Part of Administrative Expenses | The following table lists the components of net benefit costs for the pension plans and other post-employment benefits (“OPEB”) in the unaudited interim consolidated statements of operations for the three and six months ended June 30:
| Pension benefits
| Three months ended June 30 |  | Six months ended June 30
| 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | 4,508 |  |  | $ | 4,136 |  |  | $ | 8,336 |  |  | $ | 7,703 |
Non-service costs |  |  |  |  |  |  |
Interest cost | 3,511 |  |  | 4,112 |  |  | 10,217 |  |  | 8,903 |
Expected return on plan assets | (6,616) |  |  | (6,261) |  |  | (17,780) |  |  | (12,510) |
Amortization of net actuarial loss | 2,540 |  |  | 1,145 |  |  | 4,812 |  |  | 2,290 |
Amortization of prior service credits | (406) |  |  | (402) |  |  | (813) |  |  | (804) |
Impact of regulatory accounts | 4,825 |  |  | 4,769 |  |  | 11,009 |  |  | 8,307 |
| $ | 3,854 |  |  | $ | 3,363 |  |  | $ | 7,445 |  |  | $ | 6,186 |
Net benefit cost | $ | 8,362 |  |  | $ | 7,499 |  |  | $ | 15,781 |  |  | $ | 13,889 |
| OPEB
| Three months ended June 30 |  | Six months ended June 30
| 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | 1,772 |  |  | $ | 1,466 |  |  | $ | 3,544 |  |  | $ | 2,933 |
Non-service costs |  |  |  |  |  |  |
Interest cost | 3,031 |  |  | 1,755 |  |  | 4,052 |  |  | 3,574 |
Expected return on plan assets | (2,510) |  |  | (2,193) |  |  | (5,021) |  |  | (4,385) |
Amortization of net actuarial loss (gain) | 436 |  |  | (14) |  |  | 873 |  |  | (27) |
Impact of regulatory accounts | (950) |  |  | 706 |  |  | 196 |  |  | 1,625 |
| $ | 7 |  |  | $ | 254 |  |  | $ | 100 |  |  | $ | 787 |
Net benefit cost | $ | 1,779 |  |  | $ | 1,720 |  |  | $ | 3,644 |  |  | $ | 3,720 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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