CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Comprehensive Income (Loss)
Net Income	$ 62,530	$ 59,110
Other comprehensive income, net of tax:
Foreign currency translation adjustment	(2)	(2)
Postretirement medical liability adjustment	(167)	(158)
Reclassification of net losses on derivative instruments	113	113
Total Other Comprehensive Loss	(56)	(47)
Comprehensive Income	$ 62,474	$ 59,063