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Debt (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 13, 2019
Jun. 10, 2019
Mar. 23, 2019
May 31, 2019
Dec. 31, 2017
May 31, 2017
Dec. 31, 2020
Dec. 31, 2019
Feb. 29, 2020
Debt Instrument [Line Items]                  
Aggregate obligation, inclusive of unamortized financing costs             $ 894,875,000 $ 896,704,000  
Line of credit facility, outstanding amount               68,700,000  
Mortgage repurchase facilities             259,050,000 174,095,000  
Land development notes, outstanding             2,000,000.0 3,000,000.0  
Insurance premium notes, outstanding             1,300,000 3,300,000  
Loss on debt extinguishment               (10,832,000)  
Interest expense payments             66,800,000 74,900,000  
Initial 6.750% Senior Notes Due 2027 [Member]                  
Debt Instrument [Line Items]                  
Principal amount       $ 500,000,000.0          
Net proceeds from issuance of senior debt       $ 493,900,000          
Interest rate       6.75%          
Discount rate       100.00%          
Maturity year       2027          
Deferred issuance costs               6,100,000  
Exchange Notes Due 2027 [Member]                  
Debt Instrument [Line Items]                  
Principal amount                 $ 500,000,000.0
Existing Notes Due 2027 [Member]                  
Debt Instrument [Line Items]                  
Aggregate obligation, inclusive of unamortized financing costs             494,800,000    
Initial Notes Due 2025 [Member]                  
Debt Instrument [Line Items]                  
Principal amount           $ 400,000,000      
Net proceeds from issuance of senior debt           $ 395,500,000      
Interest rate           5.875%      
Discount rate           100.00%      
Maturity year           2025      
Existing Notes Due 2025 [Member]                  
Debt Instrument [Line Items]                  
Aggregate obligation, inclusive of unamortized financing costs             396,800,000    
Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, outstanding amount             $ 0    
Revolving Credit Facility [Member] | Amended And Restated Credit Agreement [Member] | Texas Capital Bank [Member]                  
Debt Instrument [Line Items]                  
Maturity date Apr. 30, 2023                
Line of credit facility. maximum borrowing capacity $ 640,000,000.0                
Revolving Credit Facility [Member] | Amended And Restated Credit Agreement [Member] | Eurodollar Rate [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 2.60%                
Revolving Credit Facility [Member] | Amended And Restated Credit Agreement [Member] | Eurodollar Rate [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 3.10%                
Revolving Credit Facility [Member] | Amended And Restated Credit Agreement [Member] | Base Rate [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 1.60%                
Revolving Credit Facility [Member] | Amended And Restated Credit Agreement [Member] | Base Rate [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 2.10%                
Mortgage Repurchase Facilities - Financial Services [Member] | Inspire [Member]                  
Debt Instrument [Line Items]                  
Weighted average interest rate             2.68%    
Mortgage Repurchase Facilities - Financial Services [Member] | Maximum [Member] | Inspire [Member]                  
Debt Instrument [Line Items]                  
Principal amount             $ 350,000,000    
Mortgage Repurchase Facilities - Financial Services [Member] | Master Repurchase Agreement [Member] | Comerica Bank And Wells Fargo [Member]                  
Debt Instrument [Line Items]                  
Incurred interest expense             3,000,000.0 2,700,000  
Mortgage Repurchase Facilities - Financial Services [Member] | Master Repurchase Agreement [Member] | Inspire [Member] | Comerica Bank And Wells Fargo [Member]                  
Debt Instrument [Line Items]                  
Mortgage repurchase facilities             $ 259,100,000 174,100,000  
December 2017 Exchange Notes [Member]                  
Debt Instrument [Line Items]                  
Principal amount         $ 400,000,000.0        
Maturity year         2025        
Extinguishment Of 6.875% Senior Note Due 2022 [Member]                  
Debt Instrument [Line Items]                  
Extinguishment amount   $ 195,700,000 $ 189,300,000         385,000,000.0  
Loss on debt extinguishment               $ 10,800,000