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Pension Plan and Other Postretirement Benefits (Tables) | 6 Months Ended
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Jun. 30, 2019
Retirement Benefits [Abstract] |
Schedule of components of net periodic benefit costs for the pension plans and other postretirement benefits | The following tables list components of net periodic benefit costs for the pension plans and other postretirement benefits. The data listed under “pension plan” includes the qualified pension plan and the non-qualified supplemental executive retirement plan. The data listed under “other benefits” is for all other postretirement benefits.
| Three Months Ended June 30
| Pension Plan |  | Other Benefits
| 2019 |  | 2018 |  | 2019 |  | 2018
Service cost | $ | 6,565 |  |  | $ | 7,402 |  |  | $ | 1,762 |  |  | $ | 2,550 |
Interest cost | 6,642 |  |  | 5,995 |  |  | 1,337 |  |  | 1,484 |
Expected return on plan assets | (7,567 | ) |  | (6,862 | ) |  | (1,435 | ) |  | (1,416 | )
Amortization of prior service cost | 1,262 |  |  | 1,263 |  |  | 49 |  |  | 11 |
Recognized net actuarial loss | 1,312 |  |  | 2,797 |  |  | 104 |  |  | 773 |
Net periodic benefit cost | $ | 8,214 |  |  | $ | 10,595 |  |  | $ | 1,817 |  |  | $ | 3,402 |
| Six Months Ended June 30
| Pension Plan |  | Other Benefits
| 2019 |  | 2018 |  | 2019 |  | 2018
Service cost | $ | 13,129 |  |  | $ | 14,804 |  |  | $ | 3,524 |  |  | $ | 5,100 |
Interest cost | 13,284 |  |  | 11,989 |  |  | 2,674 |  |  | 2,969 |
Expected return on plan assets | (15,133 | ) |  | (13,725 | ) |  | (2,871 | ) |  | (2,832 | )
Amortization of prior service cost | 2,524 |  |  | 2,526 |  |  | 99 |  |  | 21 |
Recognized net actuarial loss | 2,624 |  |  | 5,595 |  |  | 207 |  |  | 1,547 |
Net periodic benefit cost | $ | 16,428 |  |  | $ | 21,189 |  |  | $ | 3,633 |  |  | $ | 6,805 |

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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=118255775&loc=d3e1928-114920 + Details
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