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INVESTMENTS - Securities narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Fair value	$ 12,313,200	$ 12,041,799
Non-U.S. government
Schedule Of Available For Sale Securities [Line Items]
Unrealized losses	9,685	428
Fair value	795,178	671,273
Non-U.S. government | Maximum
Schedule Of Available For Sale Securities [Line Items]
Unrealized losses		1,000
CMBS
Schedule Of Available For Sale Securities [Line Items]
Unrealized losses	4,687	2,284
Fair value	$ 1,248,191	$ 1,353,587
CMBS | Weighted average
Schedule Of Available For Sale Securities [Line Items]
Subordination percentage input for determining credit losses	37.00%	29.00%
Non-agency RMBS
Schedule Of Available For Sale Securities [Line Items]
Unrealized losses	$ 2,023	$ 678
Fair value	186,164	140,104
Non-agency RMBS | Prime
Schedule Of Available For Sale Securities [Line Items]
Fair value	87,000	85,000
Non-agency RMBS | Alt A
Schedule Of Available For Sale Securities [Line Items]
Fair value	$ 74,000	$ 23,000

X

- Definition

This item represents the current level of subordination of the entity's receipt of consideration should the assets underlying the security be liquidated when the level of subordination was considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are other than temporarily impaired and the amount of such impairment determined to be related to credit loss recognized in earnings.

+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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