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COMPREHENSIVE INCOME - Narrative (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Reclassification from accumulated other comprehensive income | $ 3,881
Income tax benefit | 1,200
Interest Expense | Accumulated Net Investment Gain (Loss) Attributable to Parent |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Reclassification from accumulated other comprehensive income | 500
Other Expense | Accumulated Net Investment Gain (Loss) Attributable to Parent |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Reclassification from accumulated other comprehensive income | $ 3,400

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