CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
NET INCOME	$ 34,866	$ 22,791
Derivative instruments:
Net unrealized gain, net of tax expense	292	0
Reclassification of net realized loss, net of tax benefit	20	328
Pension and other postretirement benefits activity, net of tax expense	1,205	879
Total other comprehensive income	1,517	1,207
COMPREHENSIVE INCOME	36,383	23,998
Less: Comprehensive income attributable to noncontrolling interests	4,873	4,873
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	31,510	19,125
APS
NET INCOME	40,218	33,149
Derivative instruments:
Net unrealized gain, net of tax expense	292	0
Reclassification of net realized loss, net of tax benefit	20	328
Pension and other postretirement benefits activity, net of tax expense	1,013	752
Total other comprehensive income	1,325	1,080
COMPREHENSIVE INCOME	41,543	34,229
Less: Comprehensive income attributable to noncontrolling interests	4,873	4,873
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 36,670	$ 29,356