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Business Combination (Details) - USD ($)
$ in Thousands
2 Months Ended 3 Months Ended 5 Months Ended 8 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Apr. 26, 2018
Jun. 30, 2018
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]                                  
Revenues       $ 185,120 $ 152,052 $ 157,312 $ 129,163 $ 137,424 $ 114,342 $ 105,750 $ 100,734       $ 623,647 $ 458,250 $ 390,985
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest                             $ 81,671 64,237 50,554
GHO Homes [Member]                                  
Business Acquisition [Line Items]                                  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest   $ 35,800                              
Business Combination, Consideration Transferred, Liabilities Incurred $ 500 $ 600                              
Payments to Acquire Businesses, Gross     $ 33,200   $ 2,000                        
Business Acquisition, Percentage of Voting Interests Acquired       80.00%                 80.00%   80.00%    
Business Combination, Integration Related Costs                           $ 500      
Business Combination, Consideration Transferred     $ 42,200                 $ 44,600          
Florida Based Controlled Builder [Member]                                  
Business Acquisition [Line Items]                                  
Business Acquisition, Percentage of Voting Interests Acquired       80.00%                 80.00%   80.00%    
Previous Owner of GHO Homes [Member] | GHO Homes [Member]                                  
Business Acquisition [Line Items]                                  
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   20.00%   20.00%                 20.00%   20.00%    
Residential Real Estate [Member]                                  
Business Acquisition [Line Items]                                  
Revenues                             $ 578,893 439,520 375,821
Individual Counterparty [Member] | Residential Real Estate [Member]                                  
Business Acquisition [Line Items]                                  
Revenues                             $ 578,893 $ 439,520 $ 375,821
Individual Counterparty [Member] | Residential Real Estate [Member] | GHO Homes [Member]                                  
Business Acquisition [Line Items]                                  
Contract with Customer, Liability, Revenue Recognized                         $ 8,200