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Employee Benefit Plans: Funding Status of Employee Benefit Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Benefit plan liabilities | $ 144,049 |  | $ 144,049 |  | $ 154,472
Other income (expense), net | (1,193) | $ 580 | (703) | $ 55 |
Pension Plan |  |  |  |  |
Benefit plan liabilities | $ 51,000 |  | $ 51,000 |  | $ 51,000

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