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SEGMENT INFORMATION - Gross premiums written (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written $ 6,826,938 $ 6,898,858 $ 6,910,065
Bermuda      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written 602,432 738,258 606,452
Ireland      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written 1,516,596 1,679,646 1,805,882
U.S.      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written 3,398,108 3,090,547 2,811,537
Lloyd's of London      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written $ 1,309,802 $ 1,390,407 $ 1,686,194