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SEGMENT INFORMATION - Gross premiums written (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written $ 6,898,858 $ 6,910,065 $ 5,556,273
Bermuda      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written 738,258 606,452 529,425
Ireland      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written 1,679,646 1,805,882 1,569,956
U.S.      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written 3,090,547 2,811,537 2,814,933
Lloyd's of London      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Gross premiums written $ 1,390,407 $ 1,686,194 $ 641,959