CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net Income	$ 183,008	$ 186,840	$ 155,215
Other comprehensive income (loss), net of tax:
Reclassification of net income (loss) on derivative instruments	(452)	(452)	(452)
Postretirement medical liability adjustment	(982)	(436)	1,840
Foreign currency translation adjustment	(8)	(57)	87
Total Other Comprehensive Income (Loss)	(538)	(41)	2,379
Comprehensive Income	$ 182,470	$ 186,799	$ 157,594