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Employee Benefit Plans - Narrative (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) Retiree shares | Dec. 31, 2019 USD ($) Retiree shares | Dec. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |
Number of retirees and dependents | Retiree | 337 | 310 |
Subsidy limit percentage of expected annual fully insured premium over age threshold | 60.00% |  |
Subsidy limit percentage of expected annual fully insured premium under age threshold | $ 648,000 |  |
Annual subsidy limit percentage increases for fully insured premium over age threshold | 3.50% |  |
Estimated contributions next year | $ 2,100,000 |  |
Liabilities, including common stock | 30,581,000 | $ 27,012,000 |
Compensation (benefit) expense | $ 600,000 | 2,400,000 | $ 3,100,000
Savings Investment Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employer matching percent | 6.00% |  |
Maximum contribution, percent of employee salary | 10.00% |  |
Plan contributions charged to expense | $ 5,600,000 | 5,800,000 | 5,900,000
Deferred Compensation Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Market value of the trust assets, excluding common stock | 22,500,000 | 18,400,000 |
Liabilities, including common stock | $ 30,600,000 | $ 27,000,000.0 |
Number of common stock deferred into the rabbi trust (in shares) | shares | 495,774 | 495,774 |
Common stock held in rabbi trust | $ 5,100,000 | $ 5,100,000 |
Contributions to deferred compensation plan | $ 1,000,000.0 | $ 1,000,000.0 | $ 1,100,000

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- Definition Represents the number of retired employees, including their spouses, eligible dependents and surviving spouses (retirees), to whom Company provides benefits under the plan. + References No definition available. + Details
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- Definition Represents the entity's subsidy which is limited to the percentage of the expected annual fully-insured premium. + References No definition available. + Details
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- Definition Represents the plan contributions that are charged to expense. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year. + 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 (g) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + 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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