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Benefit Plans | 6 Months Ended
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Jun. 30, 2017
Retirement Benefits [Abstract] |
Benefit Plans | Benefit Plans The following tables provide the components of net periodic benefit cost for our pension, supplemental executive retirement and other postretirement benefit plans for three and six months ended June 30, 2017 and 2016:
|  | Three Months Ended June 30,
|  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefit Plans
(In thousands) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Service cost |  | $ | 2,484 |  |  | $ | 2,402 |  |  | $ | 220 |  |  | $ | 201 |
Interest cost |  | 3,879 |  |  | 4,024 |  |  | 186 |  |  | 180 |
Expected return on plan assets |  | (5,013 | ) |  | (4,865 | ) |  | (1,312 | ) |  | (1,221 | )
Recognized net actuarial loss |  | 1,549 |  |  | 1,567 |  |  | — |  |  | — |
Amortization of prior service cost |  | (106 | ) |  | (171 | ) |  | (1,663 | ) |  | (1,663 | )
Net periodic benefit cost (benefit) |  | $ | 2,793 |  |  | $ | 2,957 |  |  | $ | (2,569 | ) |  | $ | (2,503 | )
|  | Six Months Ended June 30,
|  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefit Plans
(In thousands) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Service cost |  | $ | 4,778 |  |  | $ | 4,565 |  |  | $ | 407 |  |  | $ | 376 |
Interest cost |  | 7,737 |  |  | 7,953 |  |  | 353 |  |  | 352 |
Expected return on plan assets |  | (10,049 | ) |  | (9,754 | ) |  | (2,624 | ) |  | (2,443 | )
Recognized net actuarial loss |  | 3,084 |  |  | 2,928 |  |  | — |  |  | — |
Amortization of prior service cost |  | (213 | ) |  | (343 | ) |  | (3,325 | ) |  | (3,325 | )
Net periodic benefit cost (benefit) |  | $ | 5,337 |  |  | $ | 5,349 |  |  | $ | (5,189 | ) |  | $ | (5,040 | )
We currently intend to make contributions totaling $9.4 million to our qualified pension plan and supplemental executive retirement plan in 2017.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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