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Employee Benefit Plans - Other changes in the plan assets and benefit obligation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Other changes recognized in accumulated other comprehensive income (loss) |  |  |
Pension liability, beginning of year | $ 9,146 | $ 8,450 | $ 2,750
Plan change |  |  | 1,276
Net prior service cost | (214) | (179) | (140)
Net loss | 6,536 | 875 | 4,564
Pension liability, end of year | 15,468 | $ 9,146 | $ 8,450
Amortization into next prior service cost over the next fiscal year | 200 |  |
Amortization of actuarial loss over the next fiscal year | $ (700) |  |

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