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INCOME TAXES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00% | 21.00%
Current tax expense (benefit) |  |  |
Federal | $ 980 | $ (1,278) | $ 260
State | 1,797 | 963 | 1,633
Total current tax expense (benefit) | 2,777 | (315) | 1,893
Deferred tax expense |  |  |
Federal | 154,068 | 327,806 | 319,551
State | 32,662 | 44,923 | 41,459
Total deferred tax expense | 186,730 | 372,729 | 361,010
Income tax expense | 189,507 | 372,414 | 362,903
Income Tax Reconciliation |  |  |
Income before income taxes | 802,316 | 1,650,991 | 1,517,935
Net Income (Loss) Attributable to Noncontrolling Interest | 0 | 0 | 3,329
Net income attributable to ONEOK before income taxes | $ 802,316 | $ 1,650,991 | $ 1,514,606
Federal statutory income tax rate | 21.00% | 21.00% | 21.00%
Provision for federal income taxes | $ 168,486 | $ 346,708 | $ 318,067
State income taxes, net of federal benefit | 13,580 | 34,545 | 38,668
Deferred tax rate change, inclusive of valuation allowance | 20,879 | 11,340 | 5,552
Other, net | (6,058) | 804 | 5,260
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount | (7,380) | (20,983) | (4,644)
Deferred tax assets |  |  |
Employee benefits and other accrued liabilities | 96,741 | 99,510 |
Federal net operating loss | 1,473,093 | 858,030 |
State net operating loss and benefits | 258,929 | 171,779 |
Derivative instruments | 134,499 | 83,710 |
Other | 12,894 | 12,769 |
Total deferred tax assets | 1,976,156 | 1,225,798 |
Carryforward expected to expire prior to utilization | (121,212) | (94,794) |
Net deferred tax assets | 1,854,944 | 1,131,004 |
Deferred tax liabilities |  |  |
Excess of tax over book depreciation | 87,021 | 84,631 |
Investment in partnerships (a) | 2,437,620 | 1,582,436 |
Total deferred tax liabilities | 2,524,641 | 1,667,067 |
Net deferred tax assets (liabilities) | 669,697 | 536,063 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 20,900 | $ 11,300 | $ 5,600

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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(8)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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