STATEMENTS OF COMPREHENSIVE INCOME STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net income	$ 231,232	$ 221,742	$ 206,434
Pension and other postemployment benefit plans, tax	140	(1,705)	(379)
Change in pension and other postemployment benefit plan liability, net of tax of $140, $(1,705), and $(379), respectively	(478)	5,823	1,250
Other comprehensive income (loss), net of tax	(478)	5,823	1,250
Comprehensive income	$ 230,754	$ 227,565	$ 207,684