Income Taxes - Changes in Unrecognized Tax Benefits (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 of the year	$ 1,958	$ 2,262	$ 3,614
Additions and (subtractions) on position taken during current year	3,799		0
Additions and (subtractions) on position taken during current year		(304)
Additions and (subtractions) on position taken in prior periods	1,478	0	0
Reductions due to settlements	0	0	(1,352)
End of the year	$ 7,235	$ 1,958	$ 2,262