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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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