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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues      
Revenues $ 8,542,242 $ 10,164,367 $ 12,593,196
Cost of sales and fuel (exclusive of items shown separately below) 5,110,146 6,788,040 9,422,708
Operations and maintenance 761,176 863,708 803,146
Depreciation and amortization 578,662 476,535 428,557
Impairment charges (Note A) 607,200 0 0
General taxes 125,028 119,156 103,922
(Gain) loss on sale of assets (1,327) 2,575 (601)
Operating income 1,361,357 1,914,353 1,835,464
Equity in net earnings from investments (Note M) 143,241 154,541 158,383
Impairment of equity investments (Note A) (37,730) 0 0
Allowance for equity funds used during construction 23,662 64,815 7,962
Other income 43,745 27,058 674
Other expense (19,073) (18,003) (14,928)
Interest expense (net of capitalized interest of $75,436, $107,275 and $28,062, respectively) (712,886) (491,773) (469,620)
Income before income taxes 802,316 1,650,991 1,517,935
Income taxes (Note L) (189,507) (372,414) (362,903)
Net income 612,809 1,278,577 1,155,032
Less: Net income attributable to noncontrolling interests 0 0 3,329
Net income attributable to ONEOK 612,809 1,278,577 1,151,703
Less: Preferred stock dividends 1,100 1,100 1,100
Net income available to common shareholders $ 611,709 $ 1,277,477 $ 1,150,603
Basic EPS (Note I) $ 1.42 $ 3.09 $ 2.80
Diluted EPS (Note I) $ 1.42 $ 3.07 $ 2.78
Average shares (thousands)      
Basic 431,105 413,560 411,485
Diluted 431,782 415,444 414,195
Commodity Sales      
Revenues      
Revenues $ 7,255,259 $ 8,916,047 $ 11,395,642
Services      
Revenues      
Revenues $ 1,286,983 $ 1,248,320 $ 1,197,554