CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 500,826	$ 635,944	$ 570,052
Derivative instruments:
Net unrealized gain (loss), net of tax benefit (expense) of $(615), $(378), and $662	1,873	1,077	(2,089)
Reclassification of net realized gain, net of tax benefit (expense) of $0, $18, and $(171) (Note 15)	0	18	592
Pension and other postretirement benefits activity, net of tax benefit (expense) of $(7,078), $(2,256), and $1,371 (Note 7)	21,553	6,840	(4,203)
Total other comprehensive income (loss)	23,426	7,935	(5,700)
COMPREHENSIVE INCOME	524,252	643,879	564,352
Less: Comprehensive income attributable to noncontrolling interests	17,224	17,224	19,493
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 507,028	$ 626,655	$ 544,859