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Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 116,003	$ (23,421)	$ 70,592	$ (64,817)
Other comprehensive income (loss):
Foreign currency translation adjustments	(180)	958	111	431
Available-for-sale investments:
Unrealized gain on investments, net of tax effect	655	53	1,097	3
Other comprehensive income, net of taxes	475	1,011	1,208	434
Comprehensive income (loss)	$ 116,478	$ (22,410)	$ 71,800	$ (64,383)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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