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Summary of Significant Accounting Policies (Reclassifications Out of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income and other financial gains	$ 8,636	$ 14,200	$ 27,746	$ 37,020
Foreign currency gains (losses)	3,924	1,622	22,102	(19,475)
Income tax gain	4,234	(8,989)	24,372	(37,241)
Net (loss) income	$ (10,078)	$ 27,666	(34,249)	$ 81,500
Amount of (Loss) Gain Reclassified From Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax gain			(415)
Net (loss) income			3,497
Amount of (Loss) Gain Reclassified From Accumulated Other Comprehensive Loss [Member] | Unrealized (Loss) Gains on Investments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income and other financial gains			1,211
Amount of (Loss) Gain Reclassified From Accumulated Other Comprehensive Loss [Member] | Unrealized (Losses) Gains on Hedging Activities, Net [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Foreign currency gains (losses)			$ 2,701

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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