CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 635,944	$ 570,052	$ 557,813
Derivative instruments:
Net unrealized loss, net of tax benefit (expense)	1,077	(2,089)	0
Reclassification of net realized gain, net of tax expense	18	592	1,137
Pension and other postretirement benefits activity, net of tax benefit (expense)	6,840	(4,203)	(10,525)
Total other comprehensive income (loss)	7,935	(5,700)	(9,388)
COMPREHENSIVE INCOME	643,879	564,352	548,425
Less: Comprehensive income attributable to noncontrolling interests	17,224	19,493	19,493
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 626,655	$ 544,859	$ 528,932