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Pension and Postretirement Plans (Tables) | 6 Months Ended
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Jun. 30, 2019
Defined Benefit Pension Plan [Member] |
Schedule of Net Benefit Costs | The total benefit arising from the Company’s defined benefit pension plans consists of the following components:
| Three Months Ended June 30 |  | Six Months Ended June 30
(in thousands) | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost | $ | 4,963 |  |  | $ | 4,317 |  |  | $ | 10,184 |  |  | $ | 9,257 |
Interest cost | 11,743 |  |  | 11,844 |  |  | 23,335 |  |  | 23,099 |
Expected return on assets | (30,285 | ) |  | (32,796 | ) |  | (61,123 | ) |  | (65,282 | )
Amortization of prior service cost | 825 |  |  | 36 |  |  | 1,234 |  |  | 78 |
Recognized actuarial loss (gain) | 37 |  |  | (2,974 | ) |  | — |  |  | (4,020 | )
Net Periodic Benefit | (12,717 | ) |  | (19,573 | ) |  | (26,370 | ) |  | (36,868 | )
Curtailment gain | — |  |  | — |  |  | — |  |  | (806 | )
Special separation benefit expense | 6,607 |  |  | — |  |  | 6,607 |  |  | — |
Total Benefit | $ | (6,110 | ) |  | $ | (19,573 | ) |  | $ | (19,763 | ) |  | $ | (37,674 | )
Schedule of Allocation of Plan Assets | The assets of the Company’s pension plan were allocated as follows:
| As of
| June 30, 2019 |  | December 31, 2018
U.S. equities | 55 | % |  | 53 | %
U.S. stock index fund | 26 | % |  | 28 | %
U.S. fixed income | 13 | % |  | 13 | %
International equities | 6 | % |  | 6 | %
| 100 | % |  | 100 | %
Supplemental Executive Retirement Plan (SERP) [Member] |
Schedule of Net Benefit Costs | The total cost arising from the Company’s Supplemental Executive Retirement Plan (SERP) consists of the following components:
| Three Months Ended June 30 |  | Six Months Ended June 30
(in thousands) | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost | $ | 215 |  |  | $ | 204 |  |  | $ | 429 |  |  | $ | 409 |
Interest cost | 1,079 |  |  | 966 |  |  | 2,157 |  |  | 1,932 |
Amortization of prior service cost | 84 |  |  | 78 |  |  | 169 |  |  | 156 |
Recognized actuarial loss | 578 |  |  | 601 |  |  | 1,157 |  |  | 1,202 |
Net Periodic Cost | $ | 1,956 |  |  | $ | 1,849 |  |  | $ | 3,912 |  |  | $ | 3,699 |
Other Postretirement Benefit Plan, Defined Benefit [Member] |
Schedule of Net Benefit Costs | Other Postretirement Plans. The total cost arising from the Company’s other postretirement plans consists of the following components:
| Three Months Ended June 30 |  | Six Months Ended June 30
(in thousands) | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost | $ | — |  |  | $ | 268 |  |  | $ | — |  |  | $ | 536 |
Interest cost | 72 |  |  | 169 |  |  | 144 |  |  | 339 |
Amortization of prior service credit | (1,840 | ) |  | (44 | ) |  | (3,681 | ) |  | (88 | )
Recognized actuarial gain | (1,090 | ) |  | (921 | ) |  | (2,180 | ) |  | (1,843 | )
Net Periodic Benefit | $ | (2,858 | ) |  | $ | (528 | ) |  | $ | (5,717 | ) |  | $ | (1,056 | )

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + 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 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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