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INCOME TAXES (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Decrease in net deferred tax liability due to enacted tax rate changes | $ 518,700,000 |  |
Regulatory Liability, Noncurrent | 520,866,000 | $ 519,421,000 |
Deferred tax expense, remeasured deferred taxes | 2,200,000 |  |
Impact to cash flows attributable to adjustments to net deferred tax liability for enacted tax rate changes | 0.0 |  |
Reduction to revenues due to the change in tax rates collected in our rates | 36,600,000 |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 50,200,000 |  |
Current income tax provision (benefit) |  |  |
Federal | 0 | 0 | $ (2,016,000)
State | 289,000 | 750,000 | 471,000
Total current income tax provision (benefit) | 289,000 | 750,000 | (1,545,000)
Deferred income tax provision |  |  |
Federal | 42,413,000 | 83,138,000 | 76,247,000
State | 10,829,000 | 9,255,000 | 10,541,000
Total deferred income tax provision | 53,242,000 | 92,393,000 | 86,788,000
Income Tax Reconciliation [Abstract] |  |  |
Income before income taxes | $ 225,765,000 | $ 256,138,000 | $ 225,338,000
Federal statutory income tax rate | 21.00% | 35.00% | 35.00%
Provision for federal income taxes | $ 47,411,000 | $ 89,648,000 | $ 78,868,000
State income taxes, net of federal benefit | 8,783,000 | 6,503,000 | 7,158,000
Effective Income Tax Rate Reconciliation, nonregulated deferred tax rate decrease | 74,000 | 2,162,000 | 0
Effective Income Tax Rate Reconciliation, tax benefit of employee share based compensation | (2,770,000) | (5,162,000) | 0
Other, net | 33,000 | (8,000) | (783,000)
Income tax provision | 53,531,000 | 93,143,000 | $ 85,243,000
Deferred tax assets |  |  |
Deferred tax assets, employee benefits and other accrued liabilities | 48,243,000 | 40,277,000 |
Deferred tax asset, regulatory adjustments | 129,201,000 | 129,421,000 |
Net operating loss | 2,778,000 | 24,712,000 |
Other | 34,000 | 2,984,000 |
Total deferred tax assets | 180,256,000 | 197,394,000 |
Deferred tax liabilities |  |  |
Excess of tax over book depreciation | 717,903,000 | 677,249,000 |
Purchased-gas cost adjustment | 8,981,000 | 13,805,000 |
Other regulatory assets and liabilities, net | 105,798,000 | 106,285,000 |
Total deferred tax liabilities | 832,682,000 | 797,339,000 |
Net deferred tax liabilities | $ 652,426,000 | 599,945,000 |
NOL Limitation | 80.00% |  |
Oklahoma Natural Gas tax reform regulatory liability | $ 15,800,000 |  |
Kansas Gas Service tax reform regulatory liability | 14,200,000 |  |
Texas Gas Service one-time refunds related to tax reform | $ 6,600,000 |  |
Minimum [Member] |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2025 |  |
Maximum [Member] |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2037 |  |
Federal income tax rate changes [Member] |  |  |
Regulatory Liability, Noncurrent | $ 520,866,000 | 519,421,000 |
Regulatory Liabilities | $ 551,800,000 | $ 519,421,000 |

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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 other adjustments. + 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 + Details
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