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OTHER COMPREHENSIVE INCOME (LOSS) - Component of other comprehensive income (loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Before Tax Amount |  |  |
Other Comprehensive Income (Loss), before Tax | $ 219,197 | $ 69,950 | $ (156,244)
Tax (Expense) Benefit |  |  |
Other Comprehensive Income (Loss), Tax | (4,974) | (3,326) | 13,353
Net of Tax Amount |  |  |
Other Comprehensive Income (Loss), Net of Tax | 214,223 | 66,624 | (142,891)
Unrealized gains (losses) on available for sale investments, net of tax |  |  |
Before Tax Amount |  |  |
Unrealized investment gains arising during the year | 211,151 | 10,165 | (280,512)
Adjustment for reclassification of net realized investment gains and OTTI losses recognized in net income | (33,892) | 60,423 | 145,766
Other Comprehensive Income (Loss), before Tax | 177,259 | 70,588 | (134,746)
Tax (Expense) Benefit |  |  |
Unrealized investment gains arising during the year | (5,732) | (5,093) | 14,128
Adjustment for reclassification of net realized investment gains and OTTI losses recognized in net income | 758 | 1,767 | (775)
Other Comprehensive Income (Loss), Tax | (4,974) | (3,326) | 13,353
Net of Tax Amount |  |  |
Unrealized investment gains arising during the year | 205,419 | 5,072 | (266,384)
Adjustment for reclassification of net realized investment gains and OTTI losses recognized in net income | (33,134) | 62,190 | 144,991
Other Comprehensive Income (Loss), Net of Tax | 172,285 | 67,262 | (121,393)
Accumulated Other-than-Temporary Impairment, net of tax |  |  |
Before Tax Amount |  |  |
Other Comprehensive Income (Loss), before Tax | 0 | 0 | 0
Tax (Expense) Benefit |  |  |
Other Comprehensive Income (Loss), Tax | 0 | 0 | 0
Net of Tax Amount |  |  |
Other Comprehensive Income (Loss), Net of Tax | 0 | 0 | 0
Cumulative foreign currency translation adjustments, net of tax |  |  |
Before Tax Amount |  |  |
Other Comprehensive Income (Loss), before Tax | 41,938 | (638) | (21,498)
Tax (Expense) Benefit |  |  |
Other Comprehensive Income (Loss), Tax | 0 | 0 | 0
Net of Tax Amount |  |  |
Other Comprehensive Income (Loss), Net of Tax | $ 41,938 | $ (638) | $ (21,498)

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