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Summary of Significant Accounting Policies (Reclassifications Out of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Interest income and other financial gains | $ 33,684 |  | $ 9,915 |  | $ 58,128 | $ 19,110
Income tax loss | 8,917 |  | 7,700 |  | 5,426 | 20,138
Net income (loss) | $ 16,217 | $ 11,864 | $ (11,252) | $ (12,919) | 28,081 | $ (24,171)
Amount of (Loss) Gain Reclassified From Accumulated Other Comprehensive Loss [Member] |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Income tax loss |  |  |  |  | (616) |
Net income (loss) |  |  |  |  | 2,729 |
Amount of (Loss) Gain Reclassified From Accumulated Other Comprehensive Loss [Member] | Unrealized Gains on Investments [Member] |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Interest income and other financial gains |  |  |  |  | $ 3,345 |

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