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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Other changes recognized in accumulated other comprehensive income (loss)      
Pension liability, beginning of year $ 23,831 $ 15,468 $ 9,146
Plan amendment 6,017    
Net prior service cost (217) (216) (214)
Net (gain) loss (5,954) 8,579 6,536
Pension liability, end of year $ 23,677 $ 23,831 $ 15,468