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Consolidated 50% Owned Subsidiaries - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2020
entity
Noncontrolling Interest [Line Items]        
Consolidated ownership percentage 50.00%     50.00%
Consolidated 50% owned subsidiaries, number of entities | entity       2
Members’ interest subject to mandatory redemption $ 40,000 $ 40,000    
Death and permanent total disability insurance policies, per policy 20,000      
Myers        
Noncontrolling Interest [Line Items]        
Earnings from consolidated 50% owned subsidiaries 11,100 $ 9,800 $ 15,100  
Myers | Variable Interest Entity, Primary Beneficiary        
Noncontrolling Interest [Line Items]        
Members’ interest subject to mandatory redemption $ 20,000