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Debt (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Dec. 13, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Debt Instrument [Line Items]            
Line of credit facility, outstanding amount       $ 68,700,000
Mortgage repurchase facilities   197,469,000   197,469,000   $ 174,095,000
Base Rate [Member] | Minimum [Member] | Texas Capital Bank [Member] | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Basis spread on variable rate 1.60%          
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] | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Maturity date Apr. 30, 2023          
Line of credit facility. maximum borrowing capacity $ 640,000,000.0          
Line of credit facility, outstanding amount   0   0    
Amended And Restated Credit Agreement [Member] | Eurodollar Rate [Member] | Minimum [Member] | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Basis spread on variable rate 2.60%          
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%          
Mortgage Repurchase Facilities - Financial Services [Member]            
Debt Instrument [Line Items]            
Mortgage repurchase facilities   197,500,000   197,500,000    
Incurred interest expense   500,000 $ 900,000 1,300,000 $ 1,500,000  
Mortgage Repurchase Facilities - Financial Services [Member] | Maximum [Member] | Inspire [Member]            
Debt Instrument [Line Items]            
Principal amount   $ 275,000,000   $ 275,000,000