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Postretirement Benefits Other than Pensions | 12 Months Ended
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Dec. 31, 2019
Postretirement Health Coverage [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Postretirement Benefits Other than Pensions | 10. Postretirement Benefits Other than Pensions The Company sponsors an unfunded defined benefit postretirement health care plan for certain employees and contributes toward the cost of health insurance benefits. In order to be eligible for these postretirement benefits, an employee must retire after attainment of age 55 and completion of 15 years of service, or attainment of age 65 and completion of 10 years of service. The Company’s Benefits Trust Committee determines retiree premiums. The Company amended the plans effective December 31, 2001 such that only retirees who were receiving benefits under the plans at that time and active employees at that time whose age plus years of service totaled at least 60 and who had at least 10 years of service as of December 31, 2001 remain eligible. 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):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018
Benefit obligation at beginning of year | ​ | $ | 2,774 | ​ | $ | 3,167
Interest cost | ​ |  | 101 | ​ |  | 96
Actuarial (gain) loss | ​ |  | 196 | ​ |  | (96)
Benefits paid | ​ |  | (336) | ​ |  | (393)
Benefit obligation at end of year | ​ | $ | 2,735 | ​ | $ | 2,774
​ Net postretirement benefit income reflected in other gains and (losses), net in the accompanying consolidated statements of operations included the following components for the years ended December 31 (amounts in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |  | 2017
Interest cost | ​ | $ | 101 | ​ | $ | 96 | ​ | $ | 108
Amortization of net actuarial loss | ​ |  | 238 | ​ |  | 257 | ​ |  | 245
Amortization of prior service credit | ​ |  | (1,314) | ​ |  | (1,314) | ​ |  | (1,314)
Total net postretirement benefit income | ​ | $ | (975) | ​ | $ | (961) | ​ | $ | (961)
​ The discount rate used to determine the benefit obligation at December 31, 2019, 2018 and 2017 was 2.70%, 3.83% and 3.15%, respectively. The discount rate used to determine the net postretirement benefit income for years ended December 31, 2019, 2018 and 2017 was 3.83%, 3.15% and 3.47%, respectively. The Company expects to contribute $0.3 million to the plan in 2020. Based on the Company’s assumptions discussed above, the Company expects to make the following estimated future benefit payments under the plan during the years ending December 31 (amounts in thousands):
​ | ​ | ​ | ​
2020 |  | $ | 302
2021 | ​ |  | 279
2022 | ​ |  | 258
2023 | ​ |  | 239
2024 | ​ |  | 223
2025 - 2029 | ​ |  | 893
​ The net loss, amortization of net loss and amortization of prior service credit recognized in other comprehensive income for 2019 was $0.2 million, $0.2 million, and $1.3 million, respectively. Included in accumulated other comprehensive loss at December 31, 2019 are the following amounts that have not yet been recognized in net postretirement benefit expense: unrecognized actuarial losses of $3.1 million ($2.2 million net of tax) and unrecognized prior service credits of $9.8 million ($7.0 million net of tax). The net gain, amortization of net loss and amortization of prior service credit recognized in other comprehensive income for 2018 was $0.1 million, $0.3 million, and $1.3 million, respectively. Included in accumulated other comprehensive loss at December 31, 2018 are the following amounts that have not yet been recognized in net postretirement benefit expense: unrecognized actuarial losses of $3.1 million ($1.7 million net of tax) and unrecognized prior service credits of $11.1 million ($6.1 million net of tax). The net loss, amortization of net loss and amortization of prior service credit recognized in other comprehensive income for 2017 was $0.3 million, $0.2 million and $1.3 million, respectively.

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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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