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Fair Value of Derivative and Other Financial Instruments - Investment in NDTs (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($)
Equity securities: |
Net gains from equity securities sold | $ 4,864
Net (losses) from equity securities still held | (10,523)
Total net (losses) on equity securities | (5,659)
Available-for-sale debt securities: |
Net (losses) on debt securities | (11,517)
Net (losses) on investment securities | $ (17,176)

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