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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
OPERATING REVENUES (NOTE 2) | $ 1,000,249 | $ 929,590 | $ 1,696,724 | $ 1,591,520
OPERATING EXPENSES |  |  |  |
Fuel and purchased power | 269,835 | 238,382 | 468,062 | 426,903
Operations and maintenance | 229,690 | 219,392 | 459,745 | 440,710
Depreciation and amortization | 158,750 | 152,482 | 316,570 | 306,561
Taxes other than income taxes | 59,495 | 56,768 | 118,978 | 113,536
Other expenses | 4,093 | 692 | 7,449 | 1,514
Total | 721,863 | 667,716 | 1,370,804 | 1,289,224
OPERATING INCOME | 278,386 | 261,874 | 325,920 | 302,296
OTHER INCOME (DEDUCTIONS) |  |  |  |
Allowance for equity funds used during construction | 9,990 | 8,811 | 19,197 | 16,508
Pension and other postretirement non-service credits — net | 28,175 | 14,142 | 55,966 | 28,053
Other income (Note 9) | 12,207 | 16,670 | 24,636 | 29,239
Other expense (Note 9) | (5,184) | (4,036) | (9,037) | (8,820)
Total | 45,188 | 35,587 | 90,762 | 64,980
INTEREST EXPENSE |  |  |  |
Interest charges | 62,777 | 62,690 | 124,715 | 121,924
Allowance for borrowed funds used during construction | (5,199) | (4,749) | (10,193) | (8,825)
Total | 57,578 | 57,941 | 114,522 | 113,099
INCOME BEFORE INCOME TAXES | 265,996 | 239,520 | 302,160 | 254,177
INCOME TAXES | 46,560 | 41,061 | 42,210 | 20,852
NET INCOME | 219,436 | 198,459 | 259,950 | 233,325
Less: Net income attributable to noncontrolling interests (Note 6) | 3,739 | 4,874 | 8,612 | 9,747
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS | $ 215,697 | $ 193,585 | $ 251,338 | $ 223,578
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING |  |  |  |
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING - BASIC (in shares) | 112,882 | 112,638 | 112,855 | 112,616
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING - DILUTED (in shares) | 113,223 | 112,879 | 113,158 | 112,871
EARNINGS PER WEIGHTED-AVERAGE COMMON SHARE OUTSTANDING |  |  |  |
Net income attributable to common shareholders - basic (in dollars per share) | $ 1.91 | $ 1.72 | $ 2.23 | $ 1.99
Net income attributable to common shareholders - diluted (in dollars per share) | $ 1.91 | $ 1.71 | $ 2.22 | $ 1.98
APS |  |  |  |
OPERATING REVENUES (NOTE 2) | $ 1,000,249 | $ 929,590 | $ 1,696,724 | $ 1,591,520
OPERATING EXPENSES |  |  |  |
Fuel and purchased power | 269,835 | 238,382 | 468,062 | 426,903
Operations and maintenance | 226,698 | 216,221 | 453,099 | 434,486
Depreciation and amortization | 158,728 | 152,460 | 316,528 | 306,518
Taxes other than income taxes | 59,478 | 56,758 | 118,950 | 113,516
Other expenses | 4,093 | 692 | 7,449 | 1,514
Total | 718,832 | 664,513 | 1,364,088 | 1,282,937
OPERATING INCOME | 281,417 | 265,077 | 332,636 | 308,583
OTHER INCOME (DEDUCTIONS) |  |  |  |
Allowance for equity funds used during construction | 9,990 | 8,811 | 19,197 | 16,508
Pension and other postretirement non-service credits — net | 28,234 | 14,421 | 56,071 | 28,683
Other income (Note 9) | 11,563 | 13,272 | 23,523 | 24,905
Other expense (Note 9) | (4,261) | (3,859) | (7,611) | (8,527)
Total | 45,526 | 32,645 | 91,180 | 61,569
INTEREST EXPENSE |  |  |  |
Interest charges | 59,930 | 56,802 | 119,318 | 112,538
Allowance for borrowed funds used during construction | (5,199) | (4,749) | (10,193) | (8,825)
Total | 54,731 | 52,053 | 109,125 | 103,713
INCOME BEFORE INCOME TAXES | 272,212 | 245,669 | 314,691 | 266,439
INCOME TAXES | 48,725 | 43,677 | 51,044 | 24,229
NET INCOME | 223,487 | 201,992 | 263,647 | 242,210
Less: Net income attributable to noncontrolling interests (Note 6) | 3,739 | 4,874 | 8,612 | 9,747
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS | $ 219,748 | $ 197,118 | $ 255,035 | $ 232,463

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