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Employee Benefit Plans - Changes in the Benefit Obligation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation, beginning $ 15,035 $ 14,409  
Service cost 261 1,353 $ 319
Interest cost 601 468 537
Actuarial experience and changes in actuarial assumptions 2,183 (1,195)  
Projected benefit obligation, ending $ 18,080 $ 15,035 $ 14,409