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Postretirement Benefits Other than Pensions (Tables) | 12 Months Ended
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Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items] |
Change in Benefit Obligation of the Postretirement Plans to the Accrued Postretirement Liability | The following table reconciles the change in benefit obligation of the postretirement plans to the accrued postretirement liability as reflected in other liabilities in the accompanying consolidated balance sheets at December 31 (amounts in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019
Benefit obligation at beginning of year | ​ | $ | 2,735 | ​ | $ | 2,774
Interest cost | ​ |  | 69 | ​ |  | 101
Actuarial loss | ​ |  | 144 | ​ |  | 196
Plan amendment | ​ | ​ | (763) | ​ | ​ | —
Benefits paid | ​ |  | (310) | ​ |  | (336)
Benefit obligation at end of year | ​ | $ | 1,875 | ​ | $ | 2,735
Postretirement Health Coverage [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Net Periodic Pension and Postretirement Benefit (Income) Expense | Net postretirement benefit income reflected in other gains and (losses), net in the accompanying statements of operations included the following components for the years ended December 31 (amounts in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018
Interest cost | ​ | $ | 69 | ​ | $ | 101 | ​ | $ | 96
Amortization of net actuarial loss | ​ |  | 245 | ​ |  | 238 | ​ |  | 257
Amortization of prior service credit | ​ |  | (1,314) | ​ |  | (1,314) | ​ |  | (1,314)
Total net postretirement benefit income | ​ | $ | (1,000) | ​ | $ | (975) | ​ | $ | (961)
​
Expected Future Benefit Payments |
​ | ​ | ​ | ​
2021 |  | $ | 191
2022 | ​ |  | 178
2023 | ​ |  | 165
2024 | ​ |  | 153
2025 | ​ |  | 141
2026 - 2030 | ​ |  | 549

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of the change in the accumulated postemployment benefit obligation from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits. + 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 (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + 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 (f) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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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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