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COMPREHENSIVE INCOME - Narrative (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Reclassification from accumulated other comprehensive income | $ (6,456)
Interest Expense | Accumulated Net Investment Gain (Loss) Attributable to Parent |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Reclassification from accumulated other comprehensive income | 400
Other Expense | Accumulated Net Investment Gain (Loss) Attributable to Parent |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Reclassification from accumulated other comprehensive income | $ 6,800

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