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Fair Value Disclosures (Schedule of Carrying Values and Fair Values of Financial Instruments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents $ 419,416 $ 394,001 $ 173,521
Secured notes receivable 2,380 2,434  
Senior notes 901,254 894,875  
Revolving line of credit  
Mortgage repurchase facilities 159,776 259,050  
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 $ 2,800 $ 3,200  
Interest rate 5.875% 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 $ 4,800 $ 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 $ 419,416 $ 394,001  
Level 1 [Member] | Fair Value [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 419,416 394,001  
Level 2 [Member] | Carrying Value [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Secured notes receivable 2,380 2,434  
Revolving line of credit  
Mortgage repurchase facilities 159,776 259,050  
Level 2 [Member] | Carrying Value [Member] | Senior Notes 5.875% [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 397,170 396,821  
Level 2 [Member] | Carrying Value [Member] | Senior Notes 6.750% [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 495,176 494,768  
Level 2 [Member] | Fair Value [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Secured notes receivable 2,380 2,448  
Revolving line of credit  
Mortgage repurchase facilities 159,776 259,050  
Level 2 [Member] | Fair Value [Member] | Senior Notes 5.875% [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 412,500 417,500  
Level 2 [Member] | Fair Value [Member] | Senior Notes 6.750% [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 530,000 533,750  
Level 3 [Member] | Carrying Value [Member] | Other Financing Obligations [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 8,908 3,286  
Level 3 [Member] | Fair Value [Member] | Other Financing Obligations [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes $ 8,908 $ 3,286  
Minimum [Member] | Insurance Premium Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest rate 3.20% 3.20%  
Maximum [Member] | Insurance Premium Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest rate 3.24% 3.24%