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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Dec. 15, 2019
Dec. 31, 2018
Apr. 16, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Total shareholders’ equity $ 5,295,694,000   $ 5,544,008,000        
Premiums receivable, net (2,738,342,000)   (3,071,390,000)        
Allowance for credit loss (8,836,000)   (7,000,000)        
Reinsurance recoverable on unpaid losses 4,496,641,000   3,877,756,000 $ 59,000,000 $ 3,501,669,000 $ 108,000,000 $ 3,159,514,000
Provision for unrecoverable reinsurance 23,711,000   18,000,000   21,000,000    
Mortgage loans held for investment 593,290,000   432,748,000        
Allowance for expected credit losses to be recognized 0            
Allowance for expected credit losses $ (323,000)   $ 0   $ 0   $ 0
Cumulative effect of adoption              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Total shareholders’ equity   $ 0