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Benefit Plans - Components of Company Plan Benefit Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Change in Projected Benefit Obligation          
Projected benefit obligation, beginning of period     $ 33,530 $ 37,551 $ 37,551
Service cost $ 351 $ 313 702 627 1,254
Interest cost 319 $ 326 637 653 1,306
Actuarial gain     0   3,180
Other reclassification     0   (8,925)
Benefits paid     (434)   (836)
Projected benefit obligation, end of period 34,435   34,435   33,530
Change in Plan Assets          
Plan assets at fair value, beginning of period     0 $ 0 0
Company contributions     434   836
Benefits paid     (434)   (836)
Plan assets at fair value, end of period 0   0   0
Unfunded Status of the Plan $ 34,435   $ 34,435   $ 33,530