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Fair Value of Derivative and Other Financial Instruments - Investments in NDT (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Equity securities:
Net gains from equity securities sold	$ 113	$ 5,443
Net gains from equity securities still held	2,943	2,636
Total net gains on equity securities	3,056	8,079
Available-for-sale debt securities:
Net (losses) on debt securities	(593)	(6,998)
Net gains on investment securities	$ 2,463	$ 1,081

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Amount of unrealized and realized gain (loss) on investment in debt and equity securities.

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