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Fair Value of Derivative and Other Financial Instruments - Investments in NDT (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Equity securities: |  |
Net gains (losses) from equity securities sold | $ (1,315) | $ 1,387
Net gains (losses) from equity securities still held | (18,931) | 9,602
Total net gains (losses) on equity securities | (20,246) | 10,989
Available-for-sale debt securities: |  |
Net gains (losses) on debt securities | (12,603) | 3,025
Net gains (losses) on investment securities | $ (32,849) | $ 14,014

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