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Business Combinations (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 14, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Nov. 30, 2016
Business Combinations [Line Items]            
Acquisition expense     $ 58   $ 395  
Revenues   $ 590,362 $ 561,729 $ 1,743,369 1,495,467  
Equity in income of unconsolidated subsidiaries         $ 14,849  
Wade Jurney Homes [Member]            
Business Combinations [Line Items]            
Acquisition expense $ 400          
Business combination, purchase price $ 37,500          
Ownership interest 50.00%         50.00%
Previously held equity interest $ 35,625          
Estimated discount for lack of control       1,900    
Equity in income of unconsolidated subsidiaries       $ 7,200    
Wade Jurney Homes [Member]            
Business Combinations [Line Items]            
Ownership subsidiary   100.00%   100.00%    
Trade Names [Member] | Wade Jurney Homes [Member]            
Business Combinations [Line Items]            
Estimated fair value $ 3,300          
Amortization period 10 years          
Non-Compete Agreements [Member] | Wade Jurney Homes [Member]            
Business Combinations [Line Items]            
Estimated fair value $ 300          
Amortization period 2 years