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INVESTMENTS - Securities narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Available For Sale Securities [Line Items]
Fair value	$ 12,468,205	$ 11,435,347
Total Unrealized Losses	32,000	215,000
Fair value	474,207	381,633
Non-U.S. government
Schedule Of Available For Sale Securities [Line Items]
Fair value	576,592	493,016
Total Unrealized Losses	2,448	16,120
Non-U.S. government | Eurozone
Schedule Of Available For Sale Securities [Line Items]
Fair value	37,000	29,000
CMBS
Schedule Of Available For Sale Securities [Line Items]
Fair value	1,365,052	1,092,530
Total Unrealized Losses	$ 4,942	$ 13,795
CMBS | Weighted Average
Schedule Of Available For Sale Securities [Line Items]
Subordination percentage input for determining credit losses	29.00%	31.00%
Non-Agency RMBS
Schedule Of Available For Sale Securities [Line Items]
Fair value	$ 84,922	$ 40,687
Total Unrealized Losses	852	1,282
Non-Agency RMBS | Prime
Schedule Of Available For Sale Securities [Line Items]
Fair value	54,000	31,000
Non-Agency RMBS | Alt A
Schedule Of Available For Sale Securities [Line Items]
Fair value	$ 11,000	$ 5,000

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.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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