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Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Nov. 27, 2015
Noncontrolling Interest [Line Items]        
Members’ interest subject to mandatory redemption $ 40,000 $ 40,000    
Death and permanent total disability insurance policies 20,000      
Reclassification and revaluation of noncontrolling interest 0 0 $ (7,367)  
Noncontrolling interests $ 4,856 656    
Myers        
Noncontrolling Interest [Line Items]        
Reclassification and revaluation of noncontrolling interest     18,800  
Noncontrolling interests       $ 7,400
Myers        
Noncontrolling Interest [Line Items]        
Ownership percentage 50.00%      
Earnings from consolidated 50% owned subsidiaries $ 11,500 $ 8,900 4,200  
Undistributed earnings     $ 500