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Consolidated 50% Owned Subsidiaries, including Variable Interest Entities ("VIE") - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Noncontrolling Interest [Line Items]          
Members’ interest subject to mandatory redemption $ 40,000   $ 40,000   $ 40,000
Net accumulated earnings 4,700 $ 2,600 5,300 $ 2,500  
Myers          
Noncontrolling Interest [Line Items]          
Cash Surrender Value of Life Insurance 20,000   20,000    
Variable Interest Entity, Primary Beneficiary          
Noncontrolling Interest [Line Items]          
Members’ interest subject to mandatory redemption 40,000   40,000    
Variable Interest Entity, Primary Beneficiary | Myers          
Noncontrolling Interest [Line Items]          
Members’ interest subject to mandatory redemption $ 20,000   $ 20,000