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Employee Retirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2021
Pension cost |
Employee retirement plans |
Schedule of reconciliation of the beginning and ending balances of the projected benefit obligation, fair value of plan assets, funded status of plans, and amounts recognized in the consolidated balance sheets. | ​
​ | ​ | ​ | ​
​ | ​ | ​ | ​
​ | ​ | December 31,
​ | ​ | 2019
​ | ​ | ​ | ​
Benefit obligation at beginning of year | ​ | $ | 40,182
Service cost | ​ | ​ | -
Interest cost | ​ | ​ | 1,642
Actuarial loss | ​ | ​ | 166
Benefits paid | ​ | ​ | (1,451)
Pension settlement | ​ | ​ | (40,539)
Benefit obligation at end of year | ​ | ​ | -
Fair value of plan assets at beginning of year | ​ | ​ | 38,053
Actual return on plan assets | ​ | ​ | 3,477
Employer contributions through December 31 | ​ | ​ | 460
Pension settlement | ​ | ​ | (40,539)
Benefits paid | ​ | ​ | (1,451)
Fair value of plan assets at end of year | ​ | ​ | -
Funded status at end of year | ​ | $ | -
Schedule of components of net periodic pension or other postretirement benefit cost | ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | 2019 | ​
Components of net periodic pension cost: | ​ | ​ | ​
Service cost | ​ | $ | - | ​
Interest cost | ​ | ​ | 1,642 | ​
Expected return on plan assets | ​ | ​ | (1,175) | ​
Amortization of net loss | ​ | ​ | 595 | ​
Effect of settlement for termination | ​ | ​ | 6,380 | ​
Net periodic pension cost | ​ | $ | 7,442 | ​
Other postretirement benefit cost |
Employee retirement plans |
Schedule of reconciliation of the beginning and ending balances of the projected benefit obligation, fair value of plan assets, funded status of plans, and amounts recognized in the consolidated balance sheets. | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​
​ | December 31,
​ | 2021 | ​ | 2020
Change in projected benefit obligation: | ​ | ​ | ​ | ​ | ​
Benefit obligation at beginning of year | $ | 6,736 | ​ | $ | 6,538
Service cost | ​ | 137 | ​ | ​ | 147
Interest cost | ​ | 137 | ​ | ​ | 191
Participant contributions | ​ | 52 | ​ | ​ | 55
Changes in actuarial assumptions | ​ | (790) | ​ | ​ | (178)
Benefits paid | ​ | (11) | ​ | ​ | (17)
Projected benefit obligation at end of year | $ | 6,261 | ​ | $ | 6,736
Amounts recognized in the consolidated balance sheets consisted of: | ​ | ​ | ​ | ​ | ​
Accrued expenses and other current liabilities | $ | 230 | ​ | $ | 250
Retiree health benefit obligation | ​ | 6,031 | ​ | ​ | 6,486
​ | $ | 6,261 | ​ | $ | 6,736
​ | ​ | ​ | ​ | ​ | ​
Schedule of components of net periodic pension or other postretirement benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2021 | ​ | ​ | 2020 | ​ | ​ | 2019
Components of net postretirement health benefit cost: | ​ | ​ | ​ | ​ | ​ | ​
Service cost | $ | 137 | ​ | $ | 147 | ​ | $ | 149
Interest cost | ​ | 137 | ​ | ​ | 191 | ​ | ​ | 252
Amortization of net gain | ​ | (312) | ​ | ​ | (310) | ​ | ​ | (312)
Net postretirement healthcare benefit cost | $ | (38) | ​ | $ | 28 | ​ | $ | 89
Schedule of assumptions used in determining net periodic costs and summary of healthcare cost trend rates | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Year Ended December 31 | ​
​ | 2021 | ​ | 2020 | ​ | ​ | 2019 | ​
Discount rate | ​ | 2.1 | % | ​ | 3.0 | % | ​ | 4.0 | %
Immediate healthcare cost trend rate | ​ | * | ​ | ​ | * | ​ | ​ | ** | ​
Ultimate healthcare cost trend rate | ​ | 4.5 | ​ | ​ | 4.5 | ​ | ​ | 4.5 | ​
Assumed annual reduction in trend rate | ​ | * | ​ | ​ | * | ​ | ​ | ** | ​
Participation | ​ | 60 | ​ | ​ | 60 | ​ | ​ | 60 | ​
* | Health Care Cost Trend rate is assumed to be 7.0% beginning in 2021 gradually reducing to an ultimate rate of 4.5% in 2030.
** | Health Care Cost Trend rate is assumed to be 7.0% beginning in 2020 gradually reducing to an ultimate rate of 4.5% in 2029.
*** | Health Care Cost Trend rate is assumed to be 6.8% beginning in 2019 gradually reducing to an ultimate rate of 4.5% in 2028.

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- Definition Tabular disclosure of net funded status and amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans. + References No definition available. + Details
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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 assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=123447040&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=123447040&loc=d3e1928-114920 + Details
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