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Benefit Plans | 6 Months Ended
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Jun. 30, 2019
Retirement Benefits [Abstract] |
Benefit Plans | Benefit Plans Tables 10.1 and 10.2 provide the components of net periodic benefit cost for our pension, supplemental executive retirement and other postretirement benefit plans for the three and six months ended June 30, 2019 and 2018.
Components of net periodic benefit cost
Table | 10.1 |  |  |  |  |  |  |  |
|  | Three Months Ended June 30,
|  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefit Plans
(In thousands) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost |  | $ | 2,176 |  |  | $ | 2,703 |  |  | $ | 360 |  |  | $ | 310 |
Interest cost |  | 3,898 |  |  | 3,765 |  |  | 274 |  |  | 203 |
Expected return on plan assets |  | (4,825 | ) |  | (5,555 | ) |  | (1,447 | ) |  | (1,591 | )
Amortization of net actuarial losses/(gains) |  | 2,039 |  |  | 1,684 |  |  | — |  |  | (79 | )
Amortization of prior service cost/(credit) |  | (70 | ) |  | (88 | ) |  | (9 | ) |  | (1,026 | )
Net periodic benefit cost (benefit) |  | $ | 3,218 |  |  | $ | 2,509 |  |  | $ | (822 | ) |  | $ | (2,183 | )
Components of net periodic benefit cost
Table | 10.2 |  |  |  |  |  |  |  |
|  |  | Six Months Ended June 30,
|  |  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefits
(in thousands) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost |  | $ | 4,172 |  |  | $ | 5,265 |  |  | $ | 672 |  |  | $ | 580 |
Interest cost |  | 7,853 |  |  | 7,547 |  |  | 565 |  |  | 417 |
Expected return on plan assets |  | (9,733 | ) |  | (11,125 | ) |  | (2,892 | ) |  | (3,179 | )
Recognized net actuarial gain (loss) |  | 4,206 |  |  | 3,469 |  |  | — |  |  | (125 | )
Amortization of prior service cost |  | (140 | ) |  | (175 | ) |  | (17 | ) |  | (2,052 | )
Net period benefit cost (benefit) |  | $ | 6,358 |  |  | $ | 4,981 |  |  | $ | (1,672 | ) |  | $ | (4,359 | )
We currently intend to make contributions totaling $10.2 million to our qualified pension plan and supplemental executive retirement plan in 2019.

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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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