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GOODWILL AND INTANGIBLE ASSETS - Gross amount and accumulated amortization by category (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount | $ 120,784 | $ 26,036 | $ 26,036 | $ 26,036
Gross amount |  | 23,030 | 23,030 | 29,166
Accumulated amortization | (66,534) | (11,165) | $ (9,356) | $ (13,390)
Total | 137,203 |  |  |
Gross amount | 531,359 | 49,066 |  |
Total | 464,825 | 37,901 |  |
Customer lists, trademark and non-compete - Media Pro |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount | 9,700 | 9,700 |  |
Accumulated amortization | (9,244) | (8,832) |  |
Total | 456 | 868 |  |
Customer relationships and customers lists - Ternian |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount | 13,330 | 13,330 |  |
Accumulated amortization | (3,666) | (2,333) |  |
Total | 9,664 | 10,997 |  |
Other intangibles - Aviabel |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount | 2,140 |  |  |
Accumulated amortization | (977) |  |  |
Total | 1,163 |  |  |
VOBA - Novae |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount | 256,942 |  |  |
Accumulated amortization | (50,104) |  |  |
Total | 206,838 |  |  |
Coverholders |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount | 63,565 |  |  |
Accumulated amortization | (1,324) |  |  |
Total | 62,241 |  |  |
Large brokers |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount | 46,641 |  |  |
Accumulated amortization | (777) |  |  |
Total | 45,864 |  |  |
SME brokers |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount | 14,126 |  |  |
Accumulated amortization | (294) |  |  |
Total | 13,832 |  |  |
MGA contract |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount | 4,131 |  |  |
Accumulated amortization | (148) |  |  |
Total | 3,983 |  |  |
U.S. state licenses |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount | 26,036 | $ 26,036 |  |
Syndicate capacity |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross amount | $ 94,748 |  |  |

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