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INVESTMENTS (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | $ 11,242,063 | $ 11,523,316
Gross Unrealized Gains (fixed maturities) | 79,360 | 70,993
Gross Unrealized Losses (fixed maturities) | (129,894) | (197,195)
Fair Value (fixed maturities) | 11,191,529 | 11,397,114
Non-credit OTTI in AOCI | (877) | (823)
Cost | 591,559 | 597,366
Gross Unrealized Gains (equities) | 68,996 | 53,446
Gross Unrealized Losses (equities) | (7,136) | (12,068)
Fair Value (equities) | 653,419 | 638,744
US Government and Agency [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 1,720,234 | 1,681,425
Gross Unrealized Gains (fixed maturities) | 2,822 | 1,648
Gross Unrealized Losses (fixed maturities) | (18,016) | (27,004)
Fair Value (fixed maturities) | 1,705,040 | 1,656,069
Non-credit OTTI in AOCI | 0 | 0
Non-US Government [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 569,044 | 613,282
Gross Unrealized Gains (fixed maturities) | 6,287 | 2,206
Gross Unrealized Losses (fixed maturities) | (24,210) | (49,654)
Fair Value (fixed maturities) | 551,121 | 565,834
Non-credit OTTI in AOCI | 0 | 0
Corporate Debt [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 4,441,008 | 4,633,834
Gross Unrealized Gains (fixed maturities) | 46,535 | 42,049
Gross Unrealized Losses (fixed maturities) | (49,426) | (75,140)
Fair Value (fixed maturities) | 4,438,117 | 4,600,743
Non-credit OTTI in AOCI | 0 | 0
Agency RMBS [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 2,289,345 | 2,487,837
Gross Unrealized Gains (fixed maturities) | 11,062 | 13,275
Gross Unrealized Losses (fixed maturities) | (30,695) | (35,977)
Fair Value (fixed maturities) | 2,269,712 | 2,465,135
Non-credit OTTI in AOCI | 0 | 0
CMBS [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 679,060 | 664,368
Gross Unrealized Gains (fixed maturities) | 5,456 | 5,433
Gross Unrealized Losses (fixed maturities) | (3,415) | (3,564)
Fair Value (fixed maturities) | 681,101 | 666,237
Non-credit OTTI in AOCI | 0 | 0
Non-Agency RMBS [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 51,459 | 57,316
Gross Unrealized Gains (fixed maturities) | 1,698 | 1,628
Gross Unrealized Losses (fixed maturities) | (1,642) | (2,023)
Fair Value (fixed maturities) | 51,515 | 56,921
Non-credit OTTI in AOCI | (877) | (823)
ABS [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 1,360,675 | 1,221,813
Gross Unrealized Gains (fixed maturities) | 3,792 | 3,244
Gross Unrealized Losses (fixed maturities) | (1,816) | (2,843)
Fair Value (fixed maturities) | 1,362,651 | 1,222,214
Non-credit OTTI in AOCI | 0 | 0
Municipals [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 131,238 | 163,441
Gross Unrealized Gains (fixed maturities) | 1,708 | 1,510
Gross Unrealized Losses (fixed maturities) | (674) | (990)
Fair Value (fixed maturities) | 132,272 | 163,961
Non-credit OTTI in AOCI | 0 | 0
Common Stock [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | 379 | 379
Gross Unrealized Gains (equities) | 235 | 41
Gross Unrealized Losses (equities) | (340) | (342)
Fair Value (equities) | 274 | 78
Exchange-Traded Funds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | 457,562 | 463,936
Gross Unrealized Gains (equities) | 68,761 | 53,405
Gross Unrealized Losses (equities) | 0 | (2,634)
Fair Value (equities) | 526,323 | 514,707
Bond Mutual Funds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | 133,618 | 133,051
Gross Unrealized Gains (equities) | 0 | 0
Gross Unrealized Losses (equities) | (6,796) | (9,092)
Fair Value (equities) | $ 126,822 | $ 123,959

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- Definition Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. + References No definition available. + Details
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