Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 10,381	$ 8,215	$ 28,713	$ 25,846
Other comprehensive income (loss), net of tax:
Change in Company-sponsored post-employment benefit plan	74	(7)	89	(9)
Comprehensive income	$ 10,455	$ 8,208	$ 28,802	$ 25,837