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Benefit Plans and Collective Bargaining Agreements - United Steelworkers Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employer contributions to defined benefit plans | $ 200,000 |  |
Total employer contributions to plans under collective-bargaining arrangements | $ 28,469 | $ 32,034 | $ 29,042
401(k) Employee Stock Ownership Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employee maximum contribution percentage | 100.00% |  |
Employee maximum contribution amount | $ 19,000 |  |
Minimum age to qualify under Economic Growth and Tax Relief Reconciliation Act | 50 years |  |
Employee additional contribution eligible under economic growth and tax relief reconciliation act | $ 6,000 |  |
Employee maximum contribution eligible under economic growth and tax relief reconciliation act | 25,000 |  |
Employer discretionary contribution | 0 | 0 | 0
Matching contributions made by employer | $ 800,000 | 700,000 | 600,000
401(k) and Profit Sharing Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employee maximum contribution percentage | 60.00% |  |
Employee maximum contribution amount | $ 19,000 |  |
Minimum age to qualify under Economic Growth and Tax Relief Reconciliation Act | 50 years |  |
Employee additional contribution eligible under economic growth and tax relief reconciliation act | $ 6,000 |  |
Employee maximum contribution eligible under economic growth and tax relief reconciliation act | $ 25,000 |  |
Employer contribution as a percentage of participant's eligible compensation | 3.00% |  |
Employer contributions to defined benefit plans |  | 200,000 | 200,000
Employer discretionary contribution | $ 0 | 0 | 0
Maximum | Other Pension, Postretirement and Supplemental Plans |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employer contributions to defined benefit plans | $ 200,000 | $ 100,000 | $ 100,000
Funding percentage under defined benefit plans |  | 80.00% |
Employer contribution percentage of each participant's eligible compensation | 4.25% |  |
Employer's contribution percentage of total contributions | 5.00% |  |

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