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SEGMENT INFORMATION - Gross premiums written (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written | $ 5,556,273 | $ 4,970,208 | $ 4,603,730
Bermuda |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written | 529,425 | 465,980 | 525,226
Ireland |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written | 1,569,956 | 1,650,229 | 1,532,753
U.S. |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written | 2,814,933 | 2,562,789 | 2,364,099
Lloyd's of London |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written | $ 641,959 | $ 291,210 | $ 181,652

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- Definition Amount of direct and assumed premiums written. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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