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Pension - Reconciliation of Changed in Benefit Obligations, Plan Assets, and Funded Status of Pension Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Curtailment gain due to plan freeze | $ 0 | $ 0 | $ 416
Change in Benefit Obligation: |  |  |
Benefit Obligation at Beginning of Period | 40,196 | 33,569 |
Service Cost | 247 | 209 | 302
Interest Cost | 1,179 | 1,338 | 1,265
Actuarial Loss | 4,098 | 4,865 |
Plan Amendments | 0 | 1,728 |
Benefits and Other Payments | (1,644) | (1,513) |
Benefit Obligation at End of Period | 44,076 | 40,196 | 33,569
Change in Plan Assets: |  |  |
Fair Value of Plan Assets at Beginning of Period | 0 | 0 |
Company Contributions | 1,644 | 1,513 |
Benefits and Other Payments | (1,644) | (1,513) |
Fair Value of Plan Assets at End of Period | 0 | 0 | $ 0
Funded Status: |  |  |
Current Liabilities | (1,787) | (1,587) |
Noncurrent Liabilities | (42,289) | (38,609) |
Net Obligation Recognized | (44,076) | (40,196) |
Amounts Recognized in Accumulated Other Comprehensive Loss Consist of: |  |  |
Net Actuarial Loss | 19,075 | 15,361 |
Prior Service Cost | 1,506 | 1,727 |
Total | 20,581 | 17,088 |
Net Amount Recognized | 15,184 | 12,605 |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent |  |  |
Amounts Recognized in Accumulated Other Comprehensive Loss Consist of: |  |  |
Less: Tax Benefit | $ 5,397 | $ 4,483 |

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