Income Taxes - Income before Income Tax, Domestic and Foreign (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Domestic	$ 42,690	$ 34,161	$ 31,379
Foreign	215	94	(118)
Income before income taxes	$ 42,905	$ 34,255	$ 31,261