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COMMITMENTS AND CONTINGENCIES - Reinsurance purchase commitment and investments (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Unrecorded Unconditional Purchase Obligation [Line Items] |  |
Unfunded commitments related to other investments | $ 507,000 | $ 414,000
Purchase commitment | 39,000 |
Funds at Lloyd's | 1,307,945 | 1,192,717
Collateral in Trust for third party agreements | 1,510,416 | 2,085,443
CMBS |  |
Unrecorded Unconditional Purchase Obligation [Line Items] |  |
Purchase commitment | 4,000 | 16,000
Lloyd's |  |
Unrecorded Unconditional Purchase Obligation [Line Items] |  |
Collateral in Trust for third party agreements | $ 1,300,000 | $ 1,200,000

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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 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 Pledged Financial Instruments, Underwriting Support + References No definition available. + Details
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- Definition The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=SL6742756-110258 + Details
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- Definition Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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