CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 17,484	$ 11,453	$ 72,329	$ 83,018
Other Comprehensive Income (Loss):
Change in unfunded benefit obligation for pension and other postretirement benefit plans - net of taxes of ($5), $73, ($10) and $146, respectively	(19)	273	(37)	549
Total other comprehensive income (loss)	(19)	273	(37)	549
Comprehensive income	$ 17,465	$ 11,726	$ 72,292	$ 83,567