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INVESTMENTS - Restricted assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Restricted Investments [Line Items] |  |
Collateral in Trust for third party agreements | $ 2,085,443 | $ 508,262
Collateral in Trust for inter-company agreements | 3,310,180 | 2,877,823
Collateral for secured letter of credit facility | 386,451 | 448,366
Funds at Lloyd's | 1,192,717 | 382,611
Collateral in Trust for third party agreements | 2,085,443 | 508,262
Securities on deposit with regulatory authorities | 53,925 | 50,290
Total restricted investments | 7,028,716 | 4,267,352
Lloyd's |  |
Restricted Investments [Line Items] |  |
Collateral in Trust for third party agreements | 1,200,000 | 383,000
Collateral in Trust for third party agreements | 1,200,000 | 383,000
Syndicate 2007 |  |
Restricted Investments [Line Items] |  |
Collateral in Trust for third party agreements | 1,120,000 |
Pledged cash for third party insurance and reinsurance agreements | 55,000 |
Collateral in Trust for third party agreements | 1,120,000 |
Syndicate 1686 |  |
Restricted Investments [Line Items] |  |
Pledged cash for third party insurance and reinsurance agreements | $ 140,000 | $ 84,000

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75027294&loc=d3e22002-158495 + Details
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