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Fair Value of Derivative and Other Financial Instruments - Investment in NDTs (Details) $ in Thousands	12 Months Ended
	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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Amount of unrealized and realized gain (loss) on investment in debt and equity securities.

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Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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