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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Tables) | 9 Months Ended
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Sep. 30, 2020
EMPLOYEE BENEFIT PLANS |
Summary of the components of net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30 | ​
​ | ​ | Nonunion Defined | ​ | Supplemental | ​ | Postretirement | ​
​ | ​ | Benefit Pension Plan | ​ | Benefit Plan | ​ | Health Benefit Plan | ​
​ |  | 2020(1) |  | 2019 |  | 2020 |  | 2019 |  | 2020(2) |  | 2019 |
​ | ​ | (in thousands) | ​
Service cost | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 46 | ​ | $ | 80 | ​
Interest cost | ​ |  | — | ​ |  | 138 | ​ |  | 2 | ​ |  | 9 | ​ |  | 144 | ​ |  | 303 | ​
Expected return on plan assets | ​ |  | — | ​ |  | 29 | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​
Amortization of prior service credit | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (8) | ​
Pension settlement expense(3) | ​ |  | — | ​ |  | 2,530 | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​
Amortization of net actuarial (gain) loss(4) | ​ |  | — | ​ |  | 50 | ​ |  | 2 | ​ |  | 24 | ​ |  | (150) | ​ |  | 225 | ​
Net periodic benefit cost | ​ | $ | — | ​ | $ | 2,747 | ​ | $ | 4 | ​ | $ | 33 | ​ | $ | 40 | ​ | $ | 600 | ​
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended September 30 | ​
​ | ​ | Nonunion Defined | ​ | Supplemental | ​ | Postretirement | ​
​ | ​ | Benefit Pension Plan | ​ | Benefit Plan | ​ | Health Benefit Plan | ​
​ |  | 2020(1) |  | 2019 |  | 2020 |  | 2019 |  | 2020(2) |  | 2019 |
​ | ​ | (in thousands) | ​
Service cost | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 140 | ​ | $ | 240 | ​
Interest cost | ​ |  | — | ​ |  | 624 | ​ |  | 7 | ​ |  | 29 | ​ |  | 432 | ​ |  | 909 | ​
Expected return on plan assets | ​ |  | — | ​ |  | (60) | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​
Amortization of prior service credit | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (25) | ​
Pension settlement expense(3) | ​ |  | — | ​ |  | 4,164 | ​ |  | 89 | ​ |  | — | ​ |  | — | ​ |  | — | ​
Amortization of net actuarial (gain) loss(4) | ​ |  | — | ​ |  | 260 | ​ |  | 7 | ​ |  | 71 | ​ |  | (448) | ​ |  | 674 | ​
Net periodic benefit cost | ​ | $ | — | ​ | $ | 4,988 | ​ | $ | 103 | ​ | $ | 100 | ​ | $ | 124 | ​ | $ | 1,798 | ​
​
(1) | Termination of the nonunion defined benefit pension plan was completed in 2019 and the plan was liquidated as of December 31, 2019.
(2) | Expense for the postretirement health benefit plan is lower for the three and nine months ended September 30, 2020, compared to the same periods of 2019, due to the impact of a lower cost prescription drug plan effective January 1, 2020.
(3) | For the nine months ended September 30, 2020, pension settlement expense for the supplemental benefit plan of $0.1 million (pre-tax), or $0.1 million (after-tax), was due to a $0.7 million benefit related to an officer retirement. For the three and nine months ended September 30, 2019, pension settlement expense for the nonunion defined benefit pension plan of $2.5 million (pre-tax), or $1.9 million (after-tax), and $4.2 million (pre-tax), or $3.1 million (after-tax), respectively, was related to lump-sum distributions from the plan of $16.0 million and $33.9 million, respectively, which included third quarter 2019 payments to purchase a nonparticipating annuity contract and transfer the remaining benefit obligation to the Pension Benefit Guaranty Corporation (the “PBGC”). During the three and nine months ended September 30, 2019, an additional $4.0 million pension termination expense (with no tax benefit) was recorded with pension settlement expense in the “Other, net” line of other income (costs) in the consolidated statements of operations. This noncash charge was related to an amount which was stranded in accumulated other comprehensive loss until the nonunion defined benefit pension obligation was settled upon plan termination.
(4) | The Company amortizes actuarial gains and losses over the average remaining active service period of the plan participants and does not use a corridor approach.

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + 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 (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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