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Debt (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 10, 2019
Mar. 23, 2019
Feb. 12, 2019
May 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
May 04, 2018
Debt Instrument [Line Items]                    
Deferred issuance costs         $ 890,606,000   $ 890,606,000   $ 784,777,000  
Line of credit facility, outstanding amount         212,000,000   212,000,000   202,500,000  
Mortgage repurchase facilities         100,745,000   100,745,000   $ 104,555,000  
Loss on debt extinguishment         (10,832,000)   $ (10,832,000)      
Amended And Restated Credit Agreement [Member] | Texas Capital Bank [Member] | Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Maturity date             Apr. 30, 2022      
Line of credit facility. maximum borrowing capacity     $ 640,000,000.0              
Line of credit facility, outstanding amount         $ 212,000,000.0   $ 212,000,000.0      
Amended And Restated Credit Agreement [Member] | Eurodollar Rate [Member] | Maximum [Member] | Texas Capital Bank [Member] | Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate     3.10%              
Amended And Restated Credit Agreement [Member] | Eurodollar Rate [Member] | Minimum [Member] | Texas Capital Bank [Member] | Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate     2.60%              
Amended And Restated Credit Agreement [Member] | Base Rate [Member] | Maximum [Member] | Texas Capital Bank [Member] | Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate     2.10%              
Amended And Restated Credit Agreement [Member] | Base Rate [Member] | Minimum [Member] | Texas Capital Bank [Member] | Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Basis spread on variable rate     1.60%              
2027 Notes [Member]                    
Debt Instrument [Line Items]                    
Principal amount       $ 500,000,000.0            
Net proceeds from issuance of senior debt       $ 494,300,000            
Interest rate       6.75%            
Maturity year       2027            
Deferred issuance costs       $ 5,700,000            
2022 Notes [Member]                    
Debt Instrument [Line Items]                    
Interest rate         6.875%   6.875%      
Maturity year         2022          
Extinguishment amount $ 195,700,000 $ 189,300,000     $ 385,000,000.0          
Loss on debt extinguishment         10,800,000          
Mortgage Repurchase Facilities - Financial Services [Member] | Comerica Bank [Member] | Financial Services [Member]                    
Debt Instrument [Line Items]                    
Incurred interest expense         900,000 $ 300,000 $ 1,500,000 $ 500,000    
Mortgage Repurchase Facilities - Financial Services [Member] | Inspire [Member] | Comerica Bank [Member]                    
Debt Instrument [Line Items]                    
Mortgage repurchase facilities         $ 100,700,000   $ 100,700,000      
Mortgage Repurchase Facilities - Financial Services [Member] | Maximum [Member] | Inspire [Member] | Comerica Bank [Member]                    
Debt Instrument [Line Items]                    
Principal amount                   $ 160,000,000