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FAIR VALUE DISCLOSURES - Carrying Value and Fair Value of Financial Instruments (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Sep. 17, 2021
Jul. 31, 2020
Mar. 31, 2020
Jun. 05, 2019
Apr. 16, 2015
Mar. 05, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Derivative asset $ 3,638,000   $ 5,294,000            
Borrowings on mortgage warehouse facilities $ 2,287,791,000 $ 1,750,669,000              
Senior Notes | 5.875% Senior Notes due 2023                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Stated interest rate (as a percent) 5.875%             5.875%  
Senior Notes | 5.625% Senior Notes due 2024                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Stated interest rate (as a percent) 5.625%               5.625%
Senior Notes | 5.875% Senior Notes due 2027                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Stated interest rate (as a percent) 5.875%           5.875%    
Senior Notes | 6.625% Senior Notes due 2027                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Stated interest rate (as a percent) 6.625%         6.625%      
Senior Notes | 5.75% Senior Notes due 2028                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Stated interest rate (as a percent) 5.75%                
Senior Notes | 5.125% Senior Notes due 2030                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Stated interest rate (as a percent) 5.125%       5.125%        
Line of Credit | $800 Million Revolving Credit Facility | Revolving Credit Facility                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Borrowings on mortgage warehouse facilities $ 100,000,000   0            
Facility Amount 800,000,000   800,000,000            
Line of Credit | $100 Million Revolving Credit Facility | Revolving Credit Facility                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Borrowings on mortgage warehouse facilities 26,700,000                
Facility Amount 100,000,000     $ 100,000,000          
Level 1 | Carrying Value                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Equity Security Investment 8,720,000   0            
Level 1 | Estimated Fair Value                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Equity Security Investment 8,720,000   0            
Level 2 | Carrying Value                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Mortgage loans held for sale 286,006,000   201,177,000            
Level 2 | Carrying Value | MBSs                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Derivative asset 1,640,000                
Derivative liability     1,847,000            
Level 2 | Carrying Value | Mortgage warehouse borrowings                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Debt 235,685,000   127,289,000            
Level 2 | Carrying Value | Loans payable and other borrowings                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Debt 406,859,000   348,741,000            
Level 2 | Carrying Value | Senior Notes | 5.875% Senior Notes due 2023                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Debt 349,126,000   348,700,000            
Level 2 | Carrying Value | Senior Notes | 5.625% Senior Notes due 2024                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Debt 348,699,000   348,295,000            
Level 2 | Carrying Value | Senior Notes | 5.875% Senior Notes due 2027                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Debt 495,561,000   494,974,000            
Level 2 | Carrying Value | Senior Notes | 6.625% Senior Notes due 2027                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Debt 318,518,000   320,915,000            
Level 2 | Carrying Value | Senior Notes | 5.75% Senior Notes due 2028                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Debt 446,028,000   445,555,000            
Level 2 | Carrying Value | Senior Notes | 5.125% Senior Notes due 2030                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Debt 494,401,000   493,926,000            
Level 2 | Carrying Value | Line of Credit | $800 Million Revolving Credit Facility | Revolving Credit Facility                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Debt 100,000,000   0            
Level 2 | Carrying Value | Line of Credit | $100 Million Revolving Credit Facility | Revolving Credit Facility                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Debt 26,692,000   0            
Level 2 | Estimated Fair Value                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Mortgage loans held for sale 286,006,000   201,177,000            
Level 2 | Estimated Fair Value | MBSs                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Derivative asset 1,640,000                
Derivative liability     1,847,000            
Level 2 | Estimated Fair Value | Mortgage warehouse borrowings                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Debt 235,685,000   127,289,000            
Level 2 | Estimated Fair Value | Loans payable and other borrowings                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Debt 406,859,000   348,741,000            
Level 2 | Estimated Fair Value | Senior Notes | 5.875% Senior Notes due 2023                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Debt 365,750,000   371,000,000            
Level 2 | Estimated Fair Value | Senior Notes | 5.625% Senior Notes due 2024                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Debt 377,405,000   375,830,000            
Level 2 | Estimated Fair Value | Senior Notes | 5.875% Senior Notes due 2027                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Debt 570,000,000   566,650,000            
Level 2 | Estimated Fair Value | Senior Notes | 6.625% Senior Notes due 2027                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Debt 316,500,000   324,240,000            
Level 2 | Estimated Fair Value | Senior Notes | 5.75% Senior Notes due 2028                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Debt 501,300,000   509,625,000            
Level 2 | Estimated Fair Value | Senior Notes | 5.125% Senior Notes due 2030                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Debt 538,150,000   560,000,000            
Level 2 | Estimated Fair Value | Line of Credit | $800 Million Revolving Credit Facility | Revolving Credit Facility                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Debt 100,000,000   0            
Level 2 | Estimated Fair Value | Line of Credit | $100 Million Revolving Credit Facility | Revolving Credit Facility                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Debt 26,692,000   0            
Level 3 | Carrying Value | IRLCs                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Derivative asset 1,998,000   5,294,000            
Level 3 | Estimated Fair Value | IRLCs                  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                  
Derivative asset $ 1,998,000   $ 5,294,000