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Acquisition of RSI Communities - Narrative (Details)
1 Months Ended 3 Months Ended
Mar. 09, 2018
USD ($)
Property
Mar. 31, 2018
USD ($)
Property
Mar. 31, 2018
USD ($)
Property
segment
Mar. 31, 2017
USD ($)
Mar. 08, 2018
USD ($)
Business Acquisition [Line Items]          
Number Of Additional Real Estate Properties | Property 3        
Number of operating segments as a result of acquired business | segment     1    
Total operating revenue     $ 373,368,000 $ 258,854,000  
Reduction of cost of sales - homes     $ (307,308,000) $ (218,455,000)  
6% Senior Notes due 2023          
Business Acquisition [Line Items]          
Stated interest rate   6.00% 6.00%    
6% Senior Notes due 2023 | Senior notes          
Business Acquisition [Line Items]          
Principal amount         $ 350,000,000
Stated interest rate 6.00%     8.50% 6.00%
Proceeds from land banking arrangements     $ 194,300,000    
RSI Communities          
Business Acquisition [Line Items]          
Cash purchase price $ 460,000,000        
Working capital adjustments 15,200,000.000000000        
Number of Units in Real Estate Property | Property   80 80    
Total operating revenue   $ 22,700,000      
Goodwill, expected tax deductible amount $ 52,000,000        
RSI Communities | Selling, General and Administrative Expenses          
Business Acquisition [Line Items]          
Acquisition related costs   $ 3,100,000 $ 3,100,000