Shareholders' Equity - Component of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 3,141,805	$ 2,808,500	$ 3,110,981	$ 2,983,434	$ 2,730,447	$ 2,757,422	$ 3,110,981	$ 2,757,422
Other comprehensive income (loss) before reclassifications							33,364
Amounts reclassified from accumulated other comprehensive loss							2,228
Other comprehensive income (loss)	48,308	21,327	(34,043)	(49,006)	10,238	(22,883)	35,592	(61,651)
Ending balance	3,377,201	3,141,805	2,808,500	3,054,405	2,983,434	2,730,447	3,377,201	3,054,405
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 income (loss) before reclassifications							(4,515)
Amounts reclassified from accumulated other comprehensive loss							2,228
Other comprehensive income (loss)							(2,287)
Ending balance	(3,612)						(3,612)
Foreign Currency Translation Adjustments
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(222,068)				(222,068)
Other comprehensive income (loss) before reclassifications							37,879
Amounts reclassified from accumulated other comprehensive loss							0
Other comprehensive income (loss)							37,879
Ending balance	(184,189)						(184,189)
Total Accumulated Other Comprehensive Loss
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(236,109)	(257,436)	(223,393)	(210,436)	(220,674)	(197,791)	(223,393)	(197,791)
Other comprehensive income (loss)	48,308	21,327	(34,043)	(49,006)	10,238	(22,883)
Ending balance	$ (187,801)	$ (236,109)	$ (257,436)	$ (259,442)	$ (210,436)	$ (220,674)	$ (187,801)	$ (259,442)