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Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 1,476,839	$ 1,303,114
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive gain(loss) before reclassifications	(13,153)	17,787	$ (13,049)
Amounts reclassified from accumulated other comprehensive loss	61	260	384
Net current-period other comprehensive loss	(13,092)	18,047	(12,665)
Ending balance	1,593,147	1,476,839	1,303,114
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(19,522)	(37,119)	(24,988)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive gain(loss) before reclassifications	(12,065)	17,597	(12,131)
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Net current-period other comprehensive loss	(12,065)	17,597	(12,131)
Ending balance	(31,587)	(19,522)	(37,119)
Unrealized Holding Gains (Losses) on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(386)	(836)	(302)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive gain(loss) before reclassifications	(1,088)	190	(918)
Amounts reclassified from accumulated other comprehensive loss	61	260	384
Net current-period other comprehensive loss	(1,027)	450	(534)
Ending balance	(1,413)	(386)	(836)
AOCI Attributable to Parent
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(19,908)	(37,955)	(25,290)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Ending balance	$ (33,000)	$ (19,908)	$ (37,955)

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

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

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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