Income Taxes Income Taxes - Summary of Uncertain Tax Positions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	$ 2,670	$ 1,879	$ 2,884
Additions of tax positions of the current year	0	1,725	393
Additions to tax positions of the prior years	209	88	0
Reductions of tax positions of the prior years	(1,236)	0	(872)
Reductions related to prior tax positions due to foreign currency	(633)	(862)	(525)
Expiration of statutes of limitations	(151)	(160)	(1)
Ending Balance	$ 859	$ 2,670	$ 1,879