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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Equity securities:
Net gains from equity securities sold	$ 514	$ 113	$ 4,675	$ 5,443
Net gains from equity securities still held	1,011	2,943	10,916	2,636
Total net gains on equity securities	1,525	3,056	15,591	8,079
Available-for-sale debt securities:
Net gains (losses) on debt securities	161	(593)	4,708	(6,998)
Net gains on investment securities	$ 1,686	$ 2,463	$ 20,299	$ 1,081

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

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-Publisher FASB
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-Topic 220
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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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