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OTHER COMPREHENSIVE INCOME (LOSS) - Component of other comprehensive income (loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Before tax amount |  |  |
Other comprehensive income (loss), before tax amount | $ (202,694) | $ 219,197 | $ 69,950
Tax (expense) benefit |  |  |
Other comprehensive income (loss), tax (expense) benefit | 700 | (4,974) | (3,326)
Net of tax amount |  |  |
Other comprehensive income (loss), net of tax amount | (201,994) | 214,223 | 66,624
Unrealized gains (losses) on available for sale investments, net of tax |  |  |
Before tax amount |  |  |
Unrealized investment gains (losses) arising during the year | (297,259) | 211,151 | 10,165
Adjustment for reclassification of net realized investment (gains) losses and OTTI losses recognized in net income | 105,730 | (33,892) | 60,423
Other comprehensive income (loss), before tax amount | (191,529) | 177,259 | 70,588
Tax (expense) benefit |  |  |
Unrealized investment gains (losses) arising during the year | 5,528 | (5,732) | (5,093)
Adjustment for reclassification of net realized investment (gains) losses and OTTI losses recognized in net income | (4,828) | 758 | 1,767
Other comprehensive income (loss), tax (expense) benefit | 700 | (4,974) | (3,326)
Net of tax amount |  |  |
Unrealized investment gains (losses) arising during the year | (291,731) | 205,419 | 5,072
Adjustment for reclassification of net realized investment (gains) losses and OTTI losses recognized in net income | 100,902 | (33,134) | 62,190
Other comprehensive income (loss), net of tax amount | (190,829) | 172,285 | 67,262
Non-credit portion of OTTI losses |  |  |
Before tax amount |  |  |
Other comprehensive income (loss), before tax amount | 0 | 0 | 0
Tax (expense) benefit |  |  |
Other comprehensive income (loss), tax (expense) benefit | 0 | 0 | 0
Net of tax amount |  |  |
Other comprehensive income (loss), net of tax amount | 0 | 0 | 0
Foreign currency translation adjustment |  |  |
Before tax amount |  |  |
Other comprehensive income (loss), before tax amount | (11,165) | 41,938 | (638)
Tax (expense) benefit |  |  |
Other comprehensive income (loss), tax (expense) benefit | 0 | 0 | 0
Net of tax amount |  |  |
Other comprehensive income (loss), net of tax amount | $ (11,165) | $ 41,938 | $ (638)

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