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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Income Statement [Abstract] |  |
OPERATING REVENUES (Note 2) | $ 783,531 | $ 696,475
OPERATING EXPENSES |  |
Fuel and purchased power | 265,269 | 198,227
Operations and maintenance | 218,342 | 230,055
Depreciation and amortization | 186,605 | 157,820
Taxes other than income taxes | 57,998 | 59,483
Other expenses | 825 | 3,356
Total | 729,039 | 648,941
OPERATING INCOME | 54,492 | 47,534
OTHER INCOME (DEDUCTIONS) |  |
Allowance for equity funds used during construction | 9,747 | 9,207
Pension and other postretirement non-service credits - net | 23,809 | 27,791
Other income (Note 9) | 1,704 | 12,429
Other expense (Note 9) | (3,422) | (3,853)
Total | 31,838 | 45,574
INTEREST EXPENSE |  |
Interest charges | 65,389 | 61,938
Allowance for borrowed funds used during construction | (4,482) | (4,994)
Total | 60,907 | 56,944
INCOME BEFORE INCOME TAXES | 25,423 | 36,164
INCOME TAXES | 4,161 | (4,350)
NET INCOME | 21,262 | 40,514
Less: Comprehensive income attributable to noncontrolling interests | 4,306 | 4,873
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS | $ 16,956 | $ 35,641
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING — BASIC (in shares) | 113,102 | 112,829
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING — DILUTED (in shares) | 113,295 | 113,093
EARNINGS PER WEIGHTED-AVERAGE COMMON SHARE OUTSTANDING |  |
Net income attributable to common shareholders - basic (in dollars per share) | $ 0.15 | $ 0.32
Net income attributable to common shareholders — diluted (in dollars per share) | $ 0.15 | $ 0.32

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1448-109256 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration