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Fair Value of Derivative and Other Financial Instruments - Investments in NDT (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Equity securities:
Net gains from equity securities sold	$ 2,502	$ 5,330
Net gains (losses) from equity securities still held	(443)	(307)
Total net gains on equity securities	2,059	5,023
Available-for-sale debt securities:
Net gains (losses) on debt securities	(3,729)	(6,405)
Net gains (losses) on investment securities	$ (1,670)	$ (1,382)

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

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