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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 1,634,501	$ 1,590,882	$ 1,593,147	$ 1,476,839
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive loss before reclassifications			(3,054)
Amounts reclassified from accumulated other comprehensive loss			274
Net current-period other comprehensive loss	(5,040)	(642)	(2,780)	(8,955)
Ending balance	1,703,307	1,630,510	1,703,307	1,630,510
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			(31,587)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive loss before reclassifications			(4,687)
Amounts reclassified from accumulated other comprehensive loss			0
Net current-period other comprehensive loss			(4,687)
Ending balance	(36,274)		(36,274)
Unrealized Gains (Losses) on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			(1,413)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive loss before reclassifications			1,633
Amounts reclassified from accumulated other comprehensive loss			274
Net current-period other comprehensive loss			1,907
Ending balance	494		494
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(30,740)	(28,221)	(33,000)	(19,908)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Net current-period other comprehensive loss	(5,040)	(642)	(2,780)	(8,955)
Ending balance	$ (35,780)	$ (28,863)	$ (35,780)	$ (28,863)

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

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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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