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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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