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Consolidated 50% Owned Subsidiaries - Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
entity
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
insurancePolicy
entity
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2020
entity
Noncontrolling Interest [Line Items]            
Ownership interest in subsidiaries 50.00%   50.00%     50.00%
Number of entities | entity 2   2     2
Members’ interest subject to mandatory redemption $ 40,000   $ 40,000   $ 40,000  
Number of death and disability insurance policies | insurancePolicy     2      
Total disability insurance policies, per policy amount 20,000   $ 20,000      
Myers            
Noncontrolling Interest [Line Items]            
Net accumulated earnings 3,300 $ 2,600 9,900 $ 8,900    
Variable Interest Entity, Primary Beneficiary | Myers            
Noncontrolling Interest [Line Items]            
Members’ interest subject to mandatory redemption $ 20,000   $ 20,000