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Consolidated 50% Owned Subsidiaries - Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
entity
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
entity
Sep. 30, 2019
USD ($)
Jun. 30, 2020
entity
Dec. 31, 2019
USD ($)
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
Total disability insurance policies, per policy amount 20,000   20,000      
Myers            
Noncontrolling Interest [Line Items]            
Net accumulated earnings 2,600 $ 5,500 8,900 $ 8,200    
Variable Interest Entity, Primary Beneficiary | Myers            
Noncontrolling Interest [Line Items]            
Members’ interest subject to mandatory redemption $ 20,000   $ 20,000