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Consolidated 50% Owned Subsidiaries - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Noncontrolling Interest [Line Items]          
Ownership interest in subsidiaries 50.00%   50.00%    
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 5,500 $ 5,100 8,200 $ 10,400  
Myers | Variable Interest Entity, Primary Beneficiary          
Noncontrolling Interest [Line Items]          
Members’ interest subject to mandatory redemption $ 20,000   $ 20,000