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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Notes) | 6 Months Ended
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Jun. 30, 2020
Defined Benefit Plan [Abstract] |
EMPLOYEE BENEFIT PLANS | EMPLOYEE BENEFIT PLANS The following tables set forth the components of net periodic benefit cost for our retirement and other postretirement benefit plans for the periods indicated:
| Retirement Benefits |  | Other Postretirement Benefits
| Three Months Ended |  | Three Months Ended
| June 30, |  | June 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
| (Thousands of dollars)
Components of net periodic benefit cost (income) |  |  |  |  |  |  |  |
Service cost | $ | 2,036 |  |  | $ | 1,954 |  |  | $ | 115 |  |  | $ | 117 |
Interest cost | 4,574 |  |  | 5,126 |  |  | 442 |  |  | 509 |
Expected return on plan assets | (6,232 | ) |  | (5,892 | ) |  | (722 | ) |  | (570 | )
Amortization of prior service cost (credit) (a) | 28 |  |  | — |  |  | — |  |  | (57 | )
Amortization of net loss (a) | 4,571 |  |  | 3,158 |  |  | 1 |  |  | 74 |
Net periodic benefit cost (income) | $ | 4,977 |  |  | $ | 4,346 |  |  | $ | (164 | ) |  | $ | 73 |
(a) - These components of net periodic benefit cost (income) are recognized in accumulated other comprehensive loss and are reclassified to other income (expense) in our Consolidated Statements of Income, with related income tax benefits of $1.0 million and $0.8 million reclassified to income tax (expense) benefit for the three months ended June 30, 2020 and 2019, respectively.
| Retirement Benefits |  | Other Postretirement Benefits
| Six Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
| (Thousands of dollars)
Components of net periodic benefit cost (income) |  |  |  |  |  |  |  |
Service cost | $ | 4,072 |  |  | $ | 3,908 |  |  | $ | 230 |  |  | $ | 234 |
Interest cost | 9,148 |  |  | 10,252 |  |  | 884 |  |  | 1,018 |
Expected return on plan assets | (12,464 | ) |  | (11,784 | ) |  | (1,444 | ) |  | (1,140 | )
Amortization of prior service cost (credit) (a) | 56 |  |  | — |  |  | — |  |  | (114 | )
Amortization of net loss (a) | 9,142 |  |  | 6,316 |  |  | 2 |  |  | 148 |
Net periodic benefit cost (income) | $ | 9,954 |  |  | $ | 8,692 |  |  | $ | (328 | ) |  | $ | 146 |
(a) - These components of net periodic benefit cost (income) are recognized in accumulated other comprehensive loss and are reclassified to other income (expense) in our Consolidated Statements of Income, with related income tax benefits of $2.1 million and $1.5 million reclassified to income tax (expense) benefit for the six months ended June 30, 2020 and 2019, respectively.

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- References No definition available. + Details
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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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