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Consolidated 50% Owned Subsidiaries, including Variable Interest Entities ("VIE") - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
entity
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Noncontrolling Interest [Line Items]      
Consolidated ownership percentage 50.00%    
Death and permanent total disability insurance policies, per policy $ 20,000    
Members’ interest subject to mandatory redemption $ 40,000 $ 40,000  
Consolidated 50% owned subsidiaries, number of entities | entity 2    
Myers      
Noncontrolling Interest [Line Items]      
Earnings from consolidated 50% owned subsidiaries $ 9,800 $ 15,100 $ 11,500
Variable Interest Entity, Primary Beneficiary | Myers      
Noncontrolling Interest [Line Items]      
Members’ interest subject to mandatory redemption $ 20,000