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BASIS OF PRESENTATION AND SIGNIFICATION ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Gross premiums written                 $ 6,898,858 $ 6,910,065 $ 5,556,273  
Underwriting income (loss) $ 49,254 $ 78,718 $ (78,659) $ (77,822) $ 194,664 $ (59,026) $ (115,726) $ (143,737)        
Operating lease right-of-use assets 111,092               111,092      
Operating lease liabilities $ 115,584               115,584      
Short-term lease expense                 1,132      
Accounting Standards Update 2016-02                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Operating lease right-of-use assets                       $ 150,000
Operating lease liabilities       $ 150,000                
Operating Segments                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Gross premiums written                 6,898,858 6,910,065 5,556,273  
Underwriting income (loss)                 (28,507) (123,827) 413,326  
Operating Segments | Insurance                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Gross premiums written                 3,675,931 3,797,592 2,814,918  
Underwriting income (loss)                 (44,019) (77,298) 241,642  
Operating Segments | Insurance | Restatement Adjustment                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Gross premiums written                     (313,000)  
Underwriting income (loss)                     14,000  
Operating Segments | Reinsurance                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Gross premiums written                 3,222,927 3,112,473 2,741,355  
Underwriting income (loss)                 $ 15,512 $ (46,529) 171,684  
Operating Segments | Reinsurance | Restatement Adjustment                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Gross premiums written                     313,000  
Underwriting income (loss)                     $ (14,000)