Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits, Excluding Interest and Penalties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 102,770	$ 90,349
Additions based on tax positions related to the current year	20,177	32,072
Additions for tax positions of prior years	14,085	8,564
Reductions for tax positions of prior years	(2,301)	(16,942)
Reductions for expiration of statutes	(8,191)	(7,481)
Settlements	(390)	(3,867)
Increase in foreign currency exchange rates	930	75
Ending balance	$ 127,080	$ 102,770