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Fair Value Disclosures (Schedule of Carrying Values and Fair Values of Financial Instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents $ 209,046 $ 316,310 $ 502,906
Senior notes 1,010,961 998,936  
Revolving line of credit  
Mortgage repurchase facilities 193,028 331,876  
Senior Notes 3.875% [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Carrying amounts include unamortized deferred financing costs, premiums and discounts $ 5,700    
Interest rate 3.875%    
Senior Notes 5.875% [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Carrying amounts include unamortized deferred financing costs, premiums and discounts   $ 4,400  
Interest rate   5.875%  
Senior Notes 6.750% [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Carrying amounts include unamortized deferred financing costs, premiums and discounts $ 4,200 $ 5,900  
Interest rate 6.75% 6.75%  
Level 1 [Member] | Carrying Value [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents $ 209,046 $ 316,310  
Level 1 [Member] | Fair Value [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 209,046 316,310  
Level 2 [Member] | Carrying Value [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Secured notes receivable 494,310 494,117  
Revolving line of credit 193,028 331,876  
Level 2 [Member] | Carrying Value [Member] | Senior Notes 3.875% [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 495,785 495,581  
Level 2 [Member] | Carrying Value [Member] | Senior Notes 5.875% [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes  
Level 2 [Member] | Carrying Value [Member] | Senior Notes 6.750% [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 20,866 9,238  
Level 2 [Member] | Fair Value [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Secured notes receivable 446,250 504,375  
Revolving line of credit 193,028 331,876  
Level 2 [Member] | Fair Value [Member] | Senior Notes 3.875% [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 515,000 526,875  
Level 2 [Member] | Fair Value [Member] | Senior Notes 5.875% [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes  
Level 2 [Member] | Fair Value [Member] | Senior Notes 6.750% [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes $ 20,866 $ 9,238  
Minimum [Member] | Insurance Premium Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest rate 2.40%   2.99%
Maximum [Member] | Insurance Premium Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest rate 3.24%   3.24%