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Nonqualified Benefit Plans | 12 Months Ended
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Dec. 31, 2018
Retirement Benefits [Abstract] |
Nonqualified Benefit Plans | Nonqualified benefit plans In addition to the qualified defined benefit pension plans reflected in the table at the beginning of this note, 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 projected benefit obligation and accumulated benefit obligation for these plans at December 31 were as follows:
| 2018 |  | 2017 |
| (In thousands)
Projected benefit obligation | $ | 93,988 |  | $ | 102,484 |
Accumulated benefit obligation | $ | 93,988 |  | $ | 102,484 |
Components of net periodic benefit cost for the Company's nonqualified benefit plans for the years ended December 31 were as follows:
| 2018 |  | 2017 |  | 2016 |
| (In thousands)
Components of net periodic benefit cost: |  |  |
Service cost | $ | 185 |  | $ | 289 |  | $ | 493 |
Interest cost | 3,157 |  | 3,494 |  | 3,742 |
Amortization of prior service cost | — |  | — |  | (80 | )
Recognized net actuarial loss | 1,047 |  | 883 |  | 952 |
Curtailment gain | — |  | — |  | (3,292 | )
Net periodic benefit cost | $ | 4,389 |  | $ | 4,666 |  | $ | 1,815 |
Weighted average assumptions used at December 31 were as follows:
| 2018 |  | 2017 |
Benefit obligation discount rate | 3.86 | % | 3.20 | %
Benefit obligation rate of compensation increase | N/A |  | N/A |
Net periodic benefit cost discount rate | 3.20 | % | 3.56 | %
Net periodic benefit cost rate of compensation increase | N/A |  | N/A |
The amount of future benefit payments for the unfunded, nonqualified benefit plans at December 31, 2018, are expected to aggregate as follows:
| 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | Thereafter |
| (In thousands)
Nonqualified benefits | $ | 7,350 |  | $ | 7,766 |  | $ | 7,787 |  | $ | 7,018 |  | $ | 7,213 |  | $ | 36,885 |
In 2012, the Company established a nonqualified defined contribution plan for certain key management employees. Expenses incurred under this plan for 2018, 2017 and 2016 were $597,000, $736,000 and $395,000, respectively. The amount of investments that the Company anticipates using to satisfy obligations under these plans at December 31 was as follows:
| 2018 |  | 2017 |
| (In thousands)
Investments |  |
Insurance contract* | $ | 73,838 |  | $ | 77,388 |
Life insurance** | 37,274 |  | 38,568 |
Other | 10,818 |  | 6,971 |
Total investments | $ | 121,930 |  | $ | 122,927 |
* | For more information on the insurance contract, see Note 7.
** | Investments of life insurance are carried on plan participants (payable upon the employee's death).
Defined contribution plans The Company sponsors various defined contribution plans for eligible employees and the costs incurred under these plans were $42.4 million in 2018, $41.2 million in 2017 and $40.9 million in 2016.

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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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