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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
OPERATING REVENUES (NOTE 2) | $ 1,254,501 | $ 1,190,787 | $ 2,846,021 | $ 2,800,818
OPERATING EXPENSES |  |  |  |
Fuel and purchased power | 353,171 | 344,862 | 780,074 | 817,672
Operations and maintenance | 236,971 | 238,582 | 677,681 | 711,759
Depreciation and amortization | 152,696 | 149,450 | 459,257 | 445,531
Taxes other than income taxes | 54,978 | 53,809 | 168,514 | 163,989
Other expenses | 1,677 | 794 | 3,191 | 1,904
Total | 799,493 | 787,497 | 2,088,717 | 2,140,855
OPERATING INCOME | 455,008 | 403,290 | 757,304 | 659,963
OTHER INCOME (DEDUCTIONS) |  |  |  |
Allowance for equity funds used during construction | 8,144 | 5,917 | 24,652 | 24,677
Pension and other postretirement non-service credits - net | 14,118 | 5,752 | 42,171 | 17,240
Other income (Note 9) | 13,881 | 15,191 | 42,888 | 35,245
Other expense (Note 9) | (5,838) | (5,740) | (14,426) | (14,448)
Total | 30,305 | 21,120 | 95,285 | 62,714
INTEREST EXPENSE |  |  |  |
Interest charges | 61,497 | 57,481 | 183,421 | 175,599
Allowance for borrowed funds used during construction | (4,663) | (3,486) | (13,488) | (14,645)
Total | 56,834 | 53,995 | 169,933 | 160,954
INCOME BEFORE INCOME TAXES | 428,479 | 370,415 | 682,656 | 561,723
INCOME TAXES | 77,234 | 53,266 | 98,086 | 72,764
NET INCOME | 351,245 | 317,149 | 584,570 | 488,959
Less: Net income attributable to noncontrolling interests (Note 6) | 4,873 | 4,873 | 14,620 | 14,620
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS | $ 346,372 | $ 312,276 | $ 569,950 | $ 474,339
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING |  |  |  |
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING - BASIC (in shares) | 112,679 | 112,463 | 112,639 | 112,408
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING - DILUTED (in shares) | 112,987 | 112,746 | 112,912 | 112,739
EARNINGS PER WEIGHTED-AVERAGE COMMON SHARE OUTSTANDING |  |  |  |
Net income attributable to common shareholders - basic (in dollars per share) | $ 3.07 | $ 2.78 | $ 5.06 | $ 4.22
Net income attributable to common shareholders - diluted (in dollars per share) | $ 3.07 | $ 2.77 | $ 5.05 | $ 4.21
APS |  |  |  |
OPERATING REVENUES (NOTE 2) | $ 1,254,501 | $ 1,190,787 | $ 2,846,021 | $ 2,800,818
OPERATING EXPENSES |  |  |  |
Fuel and purchased power | 353,171 | 344,862 | 780,074 | 817,672
Operations and maintenance | 233,452 | 235,440 | 667,938 | 699,958
Depreciation and amortization | 152,676 | 149,428 | 459,194 | 445,467
Taxes other than income taxes | 54,966 | 53,798 | 168,482 | 163,957
Other expenses | 1,677 | 794 | 3,191 | 1,904
Total | 795,942 | 784,322 | 2,078,879 | 2,128,958
OPERATING INCOME | 458,559 | 406,465 | 767,142 | 671,860
OTHER INCOME (DEDUCTIONS) |  |  |  |
Allowance for equity funds used during construction | 8,144 | 5,917 | 24,652 | 24,677
Pension and other postretirement non-service credits - net | 14,334 | 6,133 | 43,017 | 18,389
Other income (Note 9) | 13,328 | 14,534 | 38,233 | 32,641
Other expense (Note 9) | (2,799) | (2,826) | (11,326) | (10,132)
Total | 33,007 | 23,758 | 94,576 | 65,575
INTEREST EXPENSE |  |  |  |
Interest charges | 59,132 | 53,812 | 171,670 | 164,068
Allowance for borrowed funds used during construction | (4,663) | (3,486) | (13,488) | (14,645)
Total | 54,469 | 50,326 | 158,182 | 149,423
INCOME BEFORE INCOME TAXES | 437,097 | 379,897 | 703,536 | 588,012
INCOME TAXES | 81,861 | 56,154 | 106,090 | 76,070
NET INCOME | 355,236 | 323,743 | 597,446 | 511,942
Less: Net income attributable to noncontrolling interests (Note 6) | 4,873 | 4,873 | 14,620 | 14,620
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS | $ 350,363 | $ 318,870 | $ 582,826 | $ 497,322

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