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Investment in Unconsolidated Subsidiaries (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Nov. 01, 2016
Sep. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]        
Investment in unconsolidated subsidiaries   $ 20,677 $ 20,677 $ 18,275
Equity in income of unconsolidated subsidiaries   3,716 7,648  
Distribution of income from unconsolidated subsidiaries     5,246  
WJH [Member]        
Schedule of Equity Method Investments [Line Items]        
Ownership interest 50.00%      
Investment in unconsolidated subsidiaries $ 15,000      
Potential indemnification claims amount $ 1,000      
Indemnification claims period 18 months      
Incurred acquisition-related costs $ 100      
Distribution of income from unconsolidated subsidiaries   $ 1,400 $ 5,200  
Formation [Member]        
Schedule of Equity Method Investments [Line Items]        
Investment in unconsolidated subsidiaries $ 3,000