Shareholders' Equity - Component of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 2,808,500	$ 3,110,981	$ 2,730,447	$ 2,757,422	$ 3,110,981	$ 2,757,422
Other comprehensive loss before reclassifications					(13,784)
Amounts reclassified from accumulated other comprehensive loss					1,068
Other comprehensive income (loss)	21,327	(34,043)	10,238	(22,883)	(12,716)	(12,645)
Ending balance	3,141,805	2,808,500	2,983,434	2,730,447	3,141,805	2,983,434
Net Unrealized Gain (Loss) From Hedging Activities
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(1,325)			(1,325)
Other comprehensive loss before reclassifications					(4,524)
Amounts reclassified from accumulated other comprehensive loss					1,068
Other comprehensive income (loss)					(3,456)
Ending balance	(4,781)				(4,781)
Foreign Currency Translation Adjustments
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(222,068)			(222,068)
Other comprehensive loss before reclassifications					(9,260)
Amounts reclassified from accumulated other comprehensive loss					0
Other comprehensive income (loss)					(9,260)
Ending balance	(231,328)				(231,328)
Total Accumulated Other Comprehensive Loss
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(257,436)	(223,393)	(220,674)	(197,791)	(223,393)	(197,791)
Other comprehensive income (loss)	21,327	(34,043)	10,238	(22,883)
Ending balance	$ (236,109)	$ (257,436)	$ (210,436)	$ (220,674)	$ (236,109)	$ (210,436)