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DEBT - Revolving Credit Facility (Details)
1 Months Ended 3 Months Ended
Feb. 06, 2020
USD ($)
Mar. 31, 2020
USD ($)
equity_cure_right
Mar. 31, 2020
USD ($)
equity_cure_right
fiscal_quarter
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Jun. 29, 2018
USD ($)
Debt Instrument [Line Items]            
Borrowings on mortgage warehouse     $ 432,488,000 $ 159,522,000    
Revolving credit facility borrowings   $ 485,000,000 485,000,000   $ 0  
Letters of credit utilized   746,300,000 746,300,000   623,300,000  
Revolving Credit Facility            
Debt Instrument [Line Items]            
Unamortized debt issuance costs   2,000,000.0 2,000,000.0   1,800,000  
Letters of credit utilized   86,800,000 86,800,000   77,700,000  
Line of credit available   228,200,000 228,200,000   $ 522,300,000  
Revolving Credit Facility | Restated Revolving Credit Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity on line of credit $ 800,000,000.0         $ 600,000,000.0
Write-off of debt issuance costs $ 1,700,000          
Borrowings on mortgage warehouse   485,000,000.0        
Revolving credit facility borrowings   $ 40,000,000.0 $ 40,000,000.0      
Maximum consecutive days for financial covenant     5 days      
Number of consecutive fiscal quarters in which equity cure right can be used twice (in fiscal quarter) | fiscal_quarter     4      
Maximum number of times equity cure right can be exercised | equity_cure_right   5 5      
364 Day Term Loan Debt Facility            
Debt Instrument [Line Items]            
Maximum capitalization ratio     60.00%      
Minimum net worth required   $ 1,900,000,000 $ 1,900,000,000