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Fair Value of Derivative and Other Financial Instruments - Investments in NDT (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Equity securities:
Net gains from equity securities sold	$ 1,387	$ 2,828
Net gains from equity securities still held	9,602	136
Total net gains on equity securities	10,989	2,964
Available-for-sale debt securities:
Net gains (losses) on debt securities	3,025	(2,676)
Net gains on investment securities	$ 14,014	$ 288

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

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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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