CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Comprehensive Income (Loss)
Net Income	$ 29,335	$ 27,368	$ 110,989	$ 116,264
Other comprehensive income, net of tax:
Foreign currency translation adjustment	(7)	(4)	(10)	(5)
Postretirement medical liability adjustment	(168)	(158)	(502)	(474)
Reclassification of net losses on derivative instruments	113	113	339	339
Total Other Comprehensive Loss	(62)	(49)	(173)	(140)
Comprehensive Income	$ 29,273	$ 27,319	$ 110,816	$ 116,124