CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
NET INCOME	$ 168,618	$ 219,436	$ 189,880	$ 259,950
OTHER COMPREHENSIVE INCOME, NET OF TAX
Pension and other postretirement benefits activity, net of tax benefit (expense) of $709, $(53), $440, and $(357)	(2,113)	64	(1,212)	1,086
Total other comprehensive income (loss)	(1,106)	934	47	2,218
COMPREHENSIVE INCOME	167,512	220,370	189,927	262,168
Less: Comprehensive income attributable to noncontrolling interests	4,306	3,739	8,612	8,612
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	163,206	216,631	181,315	253,556
APS
NET INCOME	174,275	223,487	202,781	263,647
OTHER COMPREHENSIVE INCOME, NET OF TAX
Pension and other postretirement benefits activity, net of tax benefit (expense) of $709, $(53), $440, and $(357)	(2,161)	159	(1,341)	1,086
Total other comprehensive income (loss)	(2,161)	159	(1,341)	1,086
COMPREHENSIVE INCOME	172,114	223,646	201,440	264,733
Less: Comprehensive income attributable to noncontrolling interests	4,306	3,739	8,612	8,612
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 167,808	$ 219,907	$ 192,828	$ 256,121