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Employee benefit plans | 3 Months Ended
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Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract] |
Pension and other postretirement benefit plans | Employee benefit plans Pension and other postretirement plans The Company has noncontributory defined benefit pension plans and other postretirement benefit plans for certain eligible employees. Components of net periodic benefit cost for the Company's pension and other postretirement benefit plans were as follows:
| Pension Benefits | Other Postretirement Benefits
Three Months Ended March 31, | 2017 |  | 2016 |  | 2017 |  | 2016 |
| (In thousands)
Components of net periodic benefit cost: |  |  |  |
Service cost | $ | — |  | $ | — |  | $ | 447 |  | $ | 450 |
Interest cost | 4,014 |  | 4,390 |  | 808 |  | 949 |
Expected return on assets | (5,029 | ) | (5,280 | ) | (1,145 | ) | (1,149 | )
Amortization of prior service credit | — |  | — |  | (343 | ) | (343 | )
Amortization of net actuarial loss | 1,793 |  | 1,593 |  | 336 |  | 448 |
Net periodic benefit cost, including amount capitalized | 778 |  | 703 |  | 103 |  | 355 |
Less amount capitalized | 107 |  | 81 |  | (39 | ) | 34 |
Net periodic benefit cost | $ | 671 |  | $ | 622 |  | $ | 142 |  | $ | 321 |
Nonqualified benefit plans In addition to the qualified plan defined pension benefits reflected in the table, the Company also has unfunded, nonqualified benefit plans for executive officers and certain key management employees that generally provide for defined benefit payments at age 65 following the employee's retirement or, upon death, to their beneficiaries for a 15-year period. In February 2016, the Company froze the unfunded, nonqualified defined benefit plans to new participants and eliminated benefit increases. Vesting for participants not fully vested was retained. The Company's net periodic benefit cost for these plans for the three months ended March 31, 2017, was $1.2 million. The Company's net periodic benefit credit for these plans for the three months ended March 31, 2016, was $1.9 million, which reflects a curtailment gain of $3.3 million.

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