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INVESTMENTS - Equity method investments (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]        
Payments to acquire equity method investments $ 0 $ 0 $ 1,000,000  
Equity method investments $ 117,821,000 $ 108,103,000    
Harrington Reinsurance Holdings Limited        
Schedule of Equity Method Investments [Line Items]        
Payments to acquire equity method investments       $ 108,000,000
Equity method investment, ownership percentage       19.00%
Equity method investment, difference between carrying amount and underlying equity       $ 5,000,000
Other Equity Method Investments | U.S.        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, other than temporary impairment     9,000,000  
Equity method investments     $ 0