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Benefit Plans | 9 Months Ended
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Sep. 30, 2018
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 nine months ended September 30, 2018 and 2017.
| Table | 10.1 |  |  |  |  |  |  |  |
Components of net periodic benefit cost |  |  | Three Months Ended September 30,
|  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefit Plans
| (In thousands) |  | 2018 |  | 2017 |  | 2018 |  | 2017
| Service cost |  | $ | 2,633 |  |  | $ | 2,389 |  |  | $ | 290 |  |  | $ | 203 |
| Interest cost |  | 3,774 |  |  | 3,869 |  |  | 208 |  |  | 176 |
| Expected return on plan assets |  | (5,563 | ) |  | (5,025 | ) |  | (1,590 | ) |  | (1,312 | )
| Amortization of net actuarial losses/(gains) |  | 1,734 |  |  | 1,543 |  |  | (62 | ) |  | — |
| Amortization of prior service cost/(credit) |  | (88 | ) |  | (107 | ) |  | (1,026 | ) |  | (1,662 | )
| Net periodic benefit cost (benefit) |  | $ | 2,490 |  |  | $ | 2,669 |  |  | $ | (2,180 | ) |  | $ | (2,595 | )
| Table | 10.2 |  |  |  |  |  |  |  |
Components of net periodic benefit cost |  |  | Nine Months Ended September 30,
|  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefit Plans
| (In thousands) |  | 2018 |  | 2017 |  | 2018 |  | 2017
| Service cost |  | $ | 7,898 |  |  | $ | 7,167 |  |  | $ | 870 |  |  | $ | 610 |
| Interest cost |  | 11,321 |  |  | 11,606 |  |  | 625 |  |  | 529 |
| Expected return on plan assets |  | (16,688 | ) |  | (15,074 | ) |  | (4,769 | ) |  | (3,936 | )
| Amortization of net actuarial losses/(gains) |  | 5,203 |  |  | 4,627 |  |  | (187 | ) |  | — |
| Amortization of prior service cost/(credit) |  | (263 | ) |  | (320 | ) |  | (3,078 | ) |  | (4,987 | )
| Net periodic benefit cost (benefit) |  | $ | 7,471 |  |  | $ | 8,006 |  |  | $ | (6,539 | ) |  | $ | (7,784 | )
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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