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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

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