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Fair Value Disclosures (Schedule of Carrying Values and Fair Values of Financial Instruments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents $ 316,310 $ 394,001 $ 55,436
Secured notes receivable   2,434  
Senior notes 998,936 894,875  
Revolving line of credit  
Mortgage repurchase facilities 331,876 259,050  
Secured note receivable was paid in full 2,400    
Carrying amounts include unamortized deferred financing costs, premiums and discounts 10,302    
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 $ 5,900    
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   $ 3,200  
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 $ 4,400 $ 5,200  
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 $ 316,310 $ 394,001  
Level 1 [Member] | Fair Value [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 316,310 394,001  
Level 2 [Member] | Carrying Value [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Secured notes receivable   2,434  
Mortgage repurchase facilities 331,876 259,050  
Level 2 [Member] | Carrying Value [Member] | Senior Notes 3.875% [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 494,117    
Level 2 [Member] | Carrying Value [Member] | Senior Notes 5.875% [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes   396,821  
Level 2 [Member] | Carrying Value [Member] | Senior Notes 6.750% [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 495,581 494,768  
Level 2 [Member] | Fair Value [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Secured notes receivable   2,448  
Mortgage repurchase facilities 331,876 259,050  
Level 2 [Member] | Fair Value [Member] | Senior Notes 3.875% [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 504,375    
Level 2 [Member] | Fair Value [Member] | Senior Notes 5.875% [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes   417,500  
Level 2 [Member] | Fair Value [Member] | Senior Notes 6.750% [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 526,875 533,750  
Level 3 [Member] | Carrying Value [Member] | Other Financing Obligations [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 9,238 3,286  
Level 3 [Member] | Fair Value [Member] | Other Financing Obligations [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes $ 9,238 $ 3,286  
Minimum [Member] | Insurance Premium Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest rate 2.99% 3.20%  
Maximum [Member] | Insurance Premium Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest rate 3.24% 3.24%