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COMPREHENSIVE INCOME - Narrative (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Gain reclassified from accumulated other comprehensive income | $ 6,242
Other Expense | Accumulated Net Investment Gain (Loss) Attributable to Parent |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Gain reclassified from accumulated other comprehensive income | $ 6,200

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