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Acquisition of RSI Communities - Narrative (Details)
3 Months Ended
Mar. 09, 2018
USD ($)
Property
Mar. 31, 2019
USD ($)
segment
Mar. 31, 2018
USD ($)
Dec. 31, 2018
Mar. 08, 2018
Business Acquisition [Line Items]          
Business Combination, Acquisition Related Costs     $ 3,130,000    
Number Of Additional Real Estate Properties | Property 3        
Number of operating segments as a result of acquired business | segment   1      
Total operating revenue   $ 455,864,000 373,368,000    
Provision for income taxes   $ (4,896,000) (2,814,000)    
6% Senior Notes due September 1, 2023          
Business Acquisition [Line Items]          
Stated interest rate   6.00%      
6% Senior Notes due September 1, 2023 | Senior notes          
Business Acquisition [Line Items]          
Principal amount   $ 350,000,000      
Stated interest rate 6.00% 6.00%   6.00% 6.00%
Proceeds from land banking arrangements $ 194,300,000        
RSI Communities          
Business Acquisition [Line Items]          
Cash purchase price 479,300,000        
Working capital adjustments 15,200,000.000000000        
Goodwill, expected tax deductible amount $ 56,800,000        
RSI Communities | Selling, General and Administrative Expenses          
Business Acquisition [Line Items]          
Business Combination, Acquisition Related Costs   $ 0 $ 3,130,000