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Summary of Significant Accounting Policies (Summary of Changes in Accumulated Balances of Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance, Estimated tax (expense) benefit		$ (616)			$ (616)
Other comprehensive income (loss) before reclassifications, Estimated tax (expense) benefit					(653)
Amount of loss (gain) reclassified from accumulated other comprehensive loss, Estimated tax (expense) benefit					616
Net current period other comprehensive income (loss), Estimated tax (expense) benefit					(37)
Ending Balance, Estimated tax (expense) benefit	$ (653)				(653)
Beginning Balance		(391,577)			(391,577)
Other comprehensive income (loss) before reclassifications, net of tax					5,857
Amount of loss (gain) reclassified from accumulated other comprehensive loss, net of tax					(2,729)
Net current period other comprehensive income (loss), net of tax	4,139	(1,011)	$ (86,878)	$ (16,393)	3,128
Ending Balance	(388,449)				(388,449)
Unrealized Gains on Investments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance		3,345			3,345
Other comprehensive income (loss) before reclassifications, before tax					3,157
Amount of loss (gain) reclassified from accumulated other comprehensive loss, before tax					(3,345)
Net current period other comprehensive income (loss), before tax					(188)
Ending Balance	3,157				3,157
Foreign Currency Translation [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Beginning Balance		$ (394,306)			(394,306)
Other comprehensive income (loss) before reclassifications, before tax					3,353
Net current period other comprehensive income (loss), before tax					3,353
Ending Balance	$ (390,953)				$ (390,953)

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