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Benefit Plans | 9 Months Ended
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Sep. 30, 2016
Compensation and Retirement Disclosure [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 nine months ended September 30, 2016 and 2015:
|  | Three Months Ended September 30,
|  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefit Plans
(In thousands) |  | 2016 |  | 2015 |  | 2016 |  | 2015
Service cost |  | $ | 2,283 |  |  | $ | 2,564 |  |  | $ | 188 |  |  | $ | 208 |
Interest cost |  | 3,976 |  |  | 3,962 |  |  | 176 |  |  | 174 |
Expected return on plan assets |  | (4,877 | ) |  | (5,278 | ) |  | (1,222 | ) |  | (1,248 | )
Recognized net actuarial loss (gain) |  | 1,464 |  |  | 1,372 |  |  | — |  |  | (44 | )
Amortization of prior service cost |  | (172 | ) |  | (211 | ) |  | (1,662 | ) |  | (1,661 | )
Net periodic benefit cost (benefit) |  | $ | 2,674 |  |  | $ | 2,409 |  |  | $ | (2,520 | ) |  | $ | (2,571 | )
|  | Nine Months Ended September 30,
|  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefit Plans
(In thousands) |  | 2016 |  | 2015 |  | 2016 |  | 2015
Service cost |  | $ | 6,848 |  |  | $ | 7,692 |  |  | $ | 564 |  |  | $ | 624 |
Interest cost |  | 11,929 |  |  | 11,886 |  |  | 528 |  |  | 523 |
Expected return on plan assets |  | (14,631 | ) |  | (15,832 | ) |  | (3,665 | ) |  | (3,743 | )
Recognized net actuarial loss (gain) |  | 4,392 |  |  | 4,114 |  |  | — |  |  | (132 | )
Amortization of prior service cost |  | (515 | ) |  | (633 | ) |  | (4,987 | ) |  | (4,986 | )
Net periodic benefit cost (benefit) |  | $ | 8,023 |  |  | $ | 7,227 |  |  | $ | (7,560 | ) |  | $ | (7,714 | )
We currently intend to make contributions totaling $11.4 million to our qualified pension plan and supplemental executive retirement plan in 2016, of which $2.6 million has been contributed through September 30, 2016.

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