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Employee Benefit Plans - Schedule of Benefit Obligations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in benefit obligation:      
Benefit obligation, Beginning balance $ 43,012 $ 37,938 $ 43,750
Interest Cost 1,426 1,640 1,641
Actuarial (gains) losses 5,301 6,127 (3,522)
Benefits paid (6,728) (2,693) (3,931)
Benefit obligation, Ending balance 43,011 43,012 37,938
Change in plan assets:      
Fair value of plan assets, Beginning balance 27,206 23,181 27,977
Actual return on plan assets 2,678 4,188 (2,093)
Employer contributions 2,325 2,530 1,228
Benefits paid (6,728) (2,693) (3,931)
Fair value of plan assets, Ending balance 25,481 27,206 23,181
Unfunded status $ 17,530 $ 15,806 $ 14,757