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Pension Plan and Other Postretirement Benefits | 6 Months Ended
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Jun. 30, 2019
Retirement Benefits [Abstract] |
Pension Plan and Other Postretirement Benefits | Pension Plan and Other Postretirement Benefits The Company provides a qualified, defined-benefit, non-contributory pension plan for substantially all employees. The Company makes annual contributions to fund the amounts accrued for in the qualified pension plan. The Company also maintains an unfunded, non-qualified, supplemental executive retirement plan. The costs of the plans are charged to expense or are capitalized in utility plant as appropriate. The Company offers medical, dental, vision, and life insurance benefits for retirees and their spouses and dependents. Participants are required to pay a premium, which offsets a portion of the cost. Cash contributions made by the Company related to the pension plans were $6.3 million and $16.3 million for the six months ended June 30, 2019 and 2018, respectively. Cash contributions made by the Company related to the other postretirement benefit plans were $3.4 million and $2.7 million for the six months ended June 30, 2019 and 2018, respectively. The total 2019 estimated cash contribution to the pension plans is $18.8 million and to the other postretirement benefit plans is $7.9 million. 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 |
Service cost portion of the pension plan and other postretirement benefits is recognized in "administrative and general" expenses within the Condensed Consolidated Statements of Income. Other components of net periodic benefit costs include interest costs, expected return on plan assets, amortization of prior service costs, and recognized net actuarial loss and are reported together as "other components of net periodic benefit cost" within the Condensed Consolidated Statements of Income.

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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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