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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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