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INVESTMENTS - Restricted assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Restricted Investments [Line Items] |  |
Collateral in Trust for inter-company agreements | $ 2,121,522 | $ 3,310,180
Collateral for secured letter of credit facility | 470,051 | 386,451
Funds at Lloyd's | 1,307,945 | 1,192,717
Collateral in Trust for third party agreements | 1,510,416 | 2,085,443
Collateral in Trust for third party agreements | 1,510,416 | 2,085,443
Securities on deposit with regulatory authorities | 64,360 | 53,925
Total restricted investments | 5,474,294 | 7,028,716
Syndicate 2007 |  |
Restricted Investments [Line Items] |  |
Collateral in Trust for third party agreements | 403,000 | 1,120,000
Collateral in Trust for third party agreements | 403,000 | 1,120,000
Pledged cash for third party insurance and reinsurance agreements | 39,000 | 55,000
Syndicate 1686 |  |
Restricted Investments [Line Items] |  |
Pledged cash for third party insurance and reinsurance agreements | $ 154,000 | $ 140,000

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- Definition The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for inter-company insurance and reinsurance agreements, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + References No definition available. + Details
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- Definition The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for insurance and reinsurance agreements with third parties, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + References No definition available. + Details
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- Definition Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 825 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=75763970&loc=SL75763979-209797 + Details
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