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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Income Statement [Abstract] |  |  |  |
Net unrealized (losses) gains in accumulated other comprehensive income, tax (benefit) expense | $ 3,662 | $ (2,879) | $ 7,615 | $ (3,304)
Reclassification adjustment for realized losses included in net income, tax expense | $ (24) | $ 12 | $ (63) | $ 10

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