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Benefit Plans | 3 Months Ended
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Mar. 31, 2018
Retirement Benefits [Abstract] |
Benefit Plans | Benefit Plans Table 10.1 provides the components of net periodic benefit cost for our pension, supplemental executive retirement and other postretirement benefit plans for the three months ended March 31, 2018 and 2017.
| Table | 10.1 |  |  |  |  |  |  |  |
Components of net periodic benefit cost |  |  | Three Months Ended March 31,
|  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefit Plans
| (In thousands) |  | 2018 |  | 2017 |  | 2018 |  | 2017
| Service cost |  | $ | 2,562 |  |  | $ | 2,294 |  |  | $ | 270 |  |  | $ | 187 |
| Interest cost |  | 3,782 |  |  | 3,858 |  |  | 214 |  |  | 167 |
| Expected return on plan assets |  | (5,570 | ) |  | (5,036 | ) |  | (1,588 | ) |  | (1,312 | )
| Recognized net actuarial loss |  | 1,785 |  |  | 1,535 |  |  | (46 | ) |  | — |
| Amortization of prior service cost |  | (87 | ) |  | (107 | ) |  | (1,026 | ) |  | (1,662 | )
| Net periodic benefit cost (benefit) |  | $ | 2,472 |  |  | $ | 2,544 |  |  | $ | (2,176 | ) |  | $ | (2,620 | )
We currently intend to make contributions totaling $11 million to our qualified pension plan and supplemental executive retirement plan in 2018.

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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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