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Accumulated Other Comprehensive Income (Loss) - Schedules of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, beginning of period	$ 2,310,999
OCI before reclassifications	(3,215)
Total other comprehensive income (loss), net of tax	(3,215)	$ 6,806
Balance, end of period	2,165,877	2,791,848
Marketable Securities
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, beginning of period	(368)
OCI before reclassifications	309
Total other comprehensive income (loss), net of tax	309
Balance, end of period	(59)
Foreign Currency Translation
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, beginning of period	3,515
OCI before reclassifications	(3,524)
Total other comprehensive income (loss), net of tax	(3,524)
Balance, end of period	(9)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance, beginning of period	3,147	14,157
Total other comprehensive income (loss), net of tax	(3,215)	6,806
Balance, end of period	$ (68)	$ 20,963

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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