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Consolidated 50% Owned Subsidiaries - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Noncontrolling Interest [Line Items]      
Members’ interest subject to mandatory redemption $ 40,000   $ 40,000
Total disability insurance policies, per policy amount 20,000    
Myers      
Noncontrolling Interest [Line Items]      
Net accumulated earnings 1,300 $ 600  
Myers | Variable Interest Entity, Primary Beneficiary      
Noncontrolling Interest [Line Items]      
Members’ interest subject to mandatory redemption $ 20,000