Income Taxes - Reconciliation Of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance as of January 1	$ 1,260,970	$ 1,330,713
Additions based on tax positions related to the current year	1,694	2,302
Additions for tax positions of acquired companies	0	2,094
Additions for tax positions of prior years	7,663	4,744
Transition tax planning initiatives	0	0
Reductions resulting from the lapse of the statute of limitations	(1,239)	(2,729)
Reductions due to Luxembourg tax rate change	0	(46,841)
Settlements with taxing authorities	(497)	(1,929)
Effects of foreign currency translation	119,800
Effects of foreign currency translation		(27,384)
Balance as of December 31	$ 1,388,391	$ 1,260,970