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Schedule II - Condensed Financial Information Of The Registrant (Condensed Statements Of Operations) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Investment Income | $ 146,077 | $ 181,058 | $ 179,028 | $ 140,976 | $ 140,204 | $ 161,363 | $ 141,322 | $ 138,294 |  |  |  | $ 647,139 | $ 581,183 | $ 542,898
Net realized capital gains (losses) | 75,443 | (12,943) | 30,272 | 92,232 | (172,815) | 54,804 | 15,776 | (24,901) |  |  |  | 185,004 | (127,136) | 153,194
Other income (expense) |  |  | (18,225) | (3,300) |  | (13,408) | (6,573) | 17,033 | $ (21,525) | $ 10,460 | $ (2,948) | (11,034) | (24,771) | (21,215)
Total revenues |  |  | 2,008,727 | 1,965,836 |  | 1,936,463 | 1,883,330 | 1,750,126 | 3,974,563 | 3,633,456 | 5,569,919 | 8,231,169 | 7,361,495 | 6,622,298
Interest expense - affiliated |  |  |  |  |  |  |  |  |  |  |  | 31,693 | 31,031 | 31,603
Total claims and expenses | 1,976,943 | 1,933,158 | 1,620,413 | 1,537,009 | 2,481,858 | 1,731,201 | 1,817,815 | 1,511,100 |  |  |  | 7,132,182 | 7,603,677 | 6,202,887
INCOME (LOSS) BEFORE TAXES |  |  | 372,345 | 414,544 |  | 189,471 | 51,154 | 222,612 | 786,889 | 273,766 | 463,237 | 1,098,987 | (242,182) | 419,411
Income tax expense (benefit) |  |  | (39,477) | (59,993) |  | 8,910 | 9,633 | (7,426) | (99,470) | 2,207 | 11,117 | (89,526) | 331,223 | 63,340
NET INCOME (LOSS) | $ 217,644 | $ 104,398 | 332,868 | 354,551 | $ (385,313) | 198,381 | 60,787 | 215,186 | 687,419 | 275,973 | 474,354 | 1,009,461 | 89,041 | 482,751
Unrealized appreciation (depreciation) ("URA(D)") on securities arising during the period |  |  |  |  |  |  |  |  |  |  |  | 496,430 | (255,656) | (64,348)
Reclassification adjustment for realized losses (gains) included in net income (loss) |  |  |  |  |  |  |  |  |  |  |  | (12,613) | 27,496 | (6,950)
Total URA(D) on securities arising during the period |  |  |  |  |  |  |  |  |  |  |  | 483,817 | (228,160) | (71,298)
Foreign currency translation adjustments |  |  |  |  |  |  |  |  |  |  |  | 14,030 | (76,816) | 121,917
Benefit plan actuarial net gain (loss) for the period |  |  |  |  |  |  |  |  |  |  |  | (12,591) | (510) | 1,027
Reclassification adjustment for amortization of net (gain) loss included in net income (loss) |  |  |  |  |  |  |  |  |  |  |  | 5,453 | 5,021 | 5,477
Total benefit plan net gain (loss) for the period |  |  |  |  |  |  |  |  |  |  |  | (7,138) | 4,511 | 6,504
Total other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  | 490,709 | (300,465) | 57,123
COMPREHENSIVE INCOME (LOSS) |  |  | $ 504,077 | $ 600,997 |  | $ 173,402 | $ (42,577) | $ 35,304 | $ 1,105,074 | $ (7,273) | $ 166,129 | 1,500,170 | (211,424) | 539,874
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Investment Income |  |  |  |  |  |  |  |  |  |  |  | 3,484 | 3,790 | 1,344
Net realized capital gains (losses) |  |  |  |  |  |  |  |  |  |  |  | (66) | (57) | 80
Other income (expense) |  |  |  |  |  |  |  |  |  |  |  | 458 | (5,299) | (6,872)
Net income (loss) of subsidiaries |  |  |  |  |  |  |  |  |  |  |  | 1,026,233 | 112,859 | 509,279
Total revenues |  |  |  |  |  |  |  |  |  |  |  | 1,030,109 | 111,293 | 503,831
Interest expense - affiliated |  |  |  |  |  |  |  |  |  |  |  | 2,087 | 4,085 | 4,300
Other expenses |  |  |  |  |  |  |  |  |  |  |  | 18,561 | 18,167 | 16,780
Total claims and expenses |  |  |  |  |  |  |  |  |  |  |  | 20,648 | 22,252 | 21,080
INCOME (LOSS) BEFORE TAXES |  |  |  |  |  |  |  |  |  |  |  | 1,009,461 | 89,041 | 482,751
NET INCOME (LOSS) |  |  |  |  |  |  |  |  |  |  |  | 1,009,461 | 89,041 | 482,751
Unrealized appreciation (depreciation) ("URA(D)") on securities arising during the period |  |  |  |  |  |  |  |  |  |  |  | 496,430 | (255,656) | (64,348)
Reclassification adjustment for realized losses (gains) included in net income (loss) |  |  |  |  |  |  |  |  |  |  |  | (12,613) | 27,496 | (6,950)
Total URA(D) on securities arising during the period |  |  |  |  |  |  |  |  |  |  |  | 483,817 | (228,160) | (71,298)
Foreign currency translation adjustments |  |  |  |  |  |  |  |  |  |  |  | 14,030 | (76,816) | 121,917
Benefit plan actuarial net gain (loss) for the period |  |  |  |  |  |  |  |  |  |  |  | (12,591) | (510) | 1,027
Reclassification adjustment for amortization of net (gain) loss included in net income (loss) |  |  |  |  |  |  |  |  |  |  |  | 5,453 | 5,021 | 5,477
Total benefit plan net gain (loss) for the period |  |  |  |  |  |  |  |  |  |  |  | (7,138) | 4,511 | 6,504
Total other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  | 490,709 | (300,465) | 57,123
COMPREHENSIVE INCOME (LOSS) |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,170 | $ (211,424) | $ 539,874

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