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Pension and Other Postretirement Employee Benefits (Tables) | 9 Months Ended
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Sep. 30, 2019
General Discussion Of Pension And Other Postretirement Benefits [Abstract] |
Components of Net Periodic Cost (Benefit) | The following tables detail the components of net periodic cost (benefit) of our pension plans and other postretirement employee benefits (OPEB):
|  | Three Months Ended September 30, |
|  | Pension |  |  | OPEB |
(in thousands) |  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Service cost |  | $ | 1,942 |  |  | $ | 2,181 |  |  | $ | 93 |  |  | $ | 99 |
Interest cost |  |  | 4,618 |  |  |  | 4,344 |  |  |  | 397 |  |  |  | 391 |
Expected return on plan assets |  |  | (5,548 | ) |  |  | (5,095 | ) |  |  | — |  |  |  | — |
Amortization of prior service cost (credit) |  |  | 52 |  |  |  | 46 |  |  |  | (2,211 | ) |  |  | (2,219 | )
Amortization of actuarial loss |  |  | 3,374 |  |  |  | 4,148 |  |  |  | 253 |  |  |  | 327 |
Net periodic cost (benefit) |  | $ | 4,438 |  |  | $ | 5,624 |  |  | $ | (1,468 | ) |  | $ | (1,402 | )
|  | Nine Months Ended September 30, |
|  | Pension |  |  | OPEB |
(Dollars in thousands) |  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Service cost |  | $ | 5,825 |  |  | $ | 6,272 |  |  | $ | 278 |  |  | $ | 242 |
Interest cost |  |  | 13,849 |  |  |  | 12,648 |  |  |  | 1,191 |  |  |  | 1,091 |
Expected return on plan assets |  |  | (16,643 | ) |  |  | (14,938 | ) |  |  | — |  |  |  | — |
Amortization of prior service cost (credit) |  |  | 158 |  |  |  | 139 |  |  |  | (6,633 | ) |  |  | (6,658 | )
Amortization of actuarial loss |  |  | 10,122 |  |  |  | 12,442 |  |  |  | 760 |  |  |  | 983 |
Net periodic cost (benefit) |  | $ | 13,311 |  |  | $ | 16,563 |  |  | $ | (4,404 | ) |  | $ | (4,342 | )

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2439-114920 Reference 3: 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=118255775&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
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