Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 8,490	$ 7,911	$ 18,332	$ 17,631
Other comprehensive income (loss), net of tax:
Change in Company-sponsored post-employment benefit plan	21	(16)	15	(2)
Comprehensive income	$ 8,511	$ 7,895	$ 18,347	$ 17,629