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Employee Retirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Pension plan |
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 (gain) loss | ​ | ​ | 166
Benefits paid | ​ | ​ | (1,451)
Pension settlement | ​ | ​ | (40,539)
Curtailment | ​ | ​ | -
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 | ​ | ​ | 2018
Components of net periodic pension cost: | ​ | ​ | ​ | ​ | ​
Service cost | ​ | $ | - | ​ | $ | 409
Interest cost | ​ | ​ | 1,642 | ​ | ​ | 1,555
Expected return on plan assets | ​ | ​ | (1,175) | ​ | ​ | (1,901)
Amortization of net loss | ​ | ​ | 595 | ​ | ​ | 706
Effect of settlement for termination | ​ | ​ | 6,380 | ​ | ​ | -
Net periodic pension cost | ​ | $ | 7,442 | ​ | $ | 769
Schedule of assumptions used in determining net periodic costs and summary of healthcare cost trend rates | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Year ended December 31 | ​
​ | 2019 | ​ | 2018 | ​
Discount rates | ​ | N/A | ​ | ​ | 3.6 | %
Rates of increase in compensation levels: | ​ | ​ | ​ | ​ | ​ | ​
Salaried | ​ | N/A | ​ | ​ | 3.5 | ​
Hourly | ​ | N/A | ​ | ​ | N/A | ​
Expected long-term rate of return on assets | ​ | ​ | ​ | ​ | ​ | ​
Salaried | ​ | N/A | ​ | ​ | 5.8 | ​
Hourly | ​ | N/A | ​ | ​ | 6.5 | ​
Schedule of weighted-average asset allocation and actual allocation for the qualified pension plans by asset category | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Target | ​ | ​ | 2018
Large Cap Equity | ​ | 5 | % | ​ | $ | - | ​ | 0 | %
Mid Cap Equity | ​ | 0 | % | ​ | ​ | - | ​ | 0 | %
Small Cap Equity | ​ | 0 | % | ​ | ​ | - | ​ | 0 | %
International Equity | ​ | 2 | % | ​ | ​ | - | ​ | 0 | %
Emerging Markets Equity | ​ | 0 | % | ​ | ​ | - | ​ | 0 | %
Fixed Income and Cash Equivalents | ​ | 90 | % | ​ | ​ | 7,388 | ​ | 99 | %
Real Estate | ​ | 3 | % | ​ | ​ | 107 | ​ | 1 | %
​ | ​ | ​ | ​ | ​ | ​ | ​
Total | ​ | 100 | % | ​ | $ | 7,495 | ​ | 100 | %
Salaried Pension Plan |
Employee retirement plans |
Schedule of weighted-average asset allocation and actual allocation for the qualified pension plans by asset category | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Target | ​ | ​ | 2018
Large Cap Equity | ​ | 5 | % | ​ | $ | - | ​ | 0 | %
Mid Cap Equity | ​ | 0 | % | ​ | ​ | - | ​ | 0 | %
Small Cap Equity | ​ | 0 | % | ​ | ​ | - | ​ | 0 | %
International Equity | ​ | 2 | % | ​ | ​ | - | ​ | 0 | %
Emerging Markets Equity | ​ | 0 | % | ​ | ​ | - | ​ | 0 | %
Fixed Income and Cash Equivalents | ​ | 90 | % | ​ | ​ | 30,009 | ​ | 98 | %
Real Estate | ​ | 3 | % | ​ | ​ | 549 | ​ | 2 | %
​ | ​ | ​ | ​ | ​ | ​ | ​
Total | ​ | 100 | % | ​ | $ | 30,558 | ​ | 100 | %
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
​ | 2020 | ​ | 2019
Change in projected benefit obligation: | ​ | ​ | ​ | ​ | ​
Benefit obligation at beginning of year | $ | 6,538 | ​ | $ | 6,420
Service cost | ​ | 147 | ​ | ​ | 149
Interest cost | ​ | 191 | ​ | ​ | 252
Participant contributions | ​ | 55 | ​ | ​ | 38
Changes in actuarial assumptions | ​ | (178) | ​ | ​ | (266)
Benefits paid | ​ | (17) | ​ | ​ | (55)
Projected benefit obligation at end of year | $ | 6,736 | ​ | $ | 6,538
Amounts recognized in the consolidated balance sheets consisted of: | ​ | ​ | ​ | ​ | ​
Accrued expenses and other current liabilities | $ | 250 | ​ | $ | 200
Retiree health benefit obligation | ​ | 6,486 | ​ | ​ | 6,338
​ | $ | 6,736 | ​ | $ | 6,538
​ | ​ | ​ | ​ | ​ | ​
Schedule of components of net periodic pension or other postretirement benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 | ​ | ​ | 2019 | ​ | ​ | 2018
Components of net postretirement health benefit cost: | ​ | ​ | ​ | ​ | ​ | ​
Service cost | $ | 147 | ​ | $ | 149 | ​ | $ | 189
Interest cost | ​ | 191 | ​ | ​ | 252 | ​ | ​ | 233
Amortization of net gain | ​ | (310) | ​ | ​ | (312) | ​ | ​ | (211)
Net postretirement healthcare benefit cost | $ | 28 | ​ | $ | 89 | ​ | $ | 211
Schedule of assumptions used in determining net periodic costs and summary of healthcare cost trend rates | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Year Ended December 31 | ​
​ | 2020 | ​ | 2019 | ​ | ​ | 2018 | ​
Discount rate | ​ | 3.0 | % | ​ | 4.0 | % | ​ | 3.4 | %
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 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.
*** | Health Care Cost Trend rate is assumed to be 6.8% beginning in 2018 gradually reducing to an ultimate rate of 4.5% in 2027.

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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 the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + 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 (d)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -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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