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VARIABLE INTEREST ENTITES (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Variable Interest Entity [Line Items] |  |  |  |
Restricted Cash and Cash Equivalents | $ 20,552,000 | $ 8,446,000 |  |
Accounts receivable, net | 347,864,000 | 553,834,000 |  |
Current maturities of securitized utility tariff bonds | 27,430,000 | 20,716,000 |  |
Accounts payable | 278,056,000 | 360,493,000 |  |
Stockholders' Equity Attributable to Parent | 2,765,877,000 | 2,584,426,000 | $ 2,349,532,000 | $ 2,233,311,000
Depreciation and amortization | (30,219,000) | (3,521,000) |  |
Discounts and issuance costs for securitized utility tariff bonds, excluding current maturities | 5,300,000 | 5,900,000 |  |
Other Assets | US Treasury Securities |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement | 6,496,000 | 4,695,000 |  |
Other Assets | Corporate Bond Securities |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement | 11,080,000 | 9,710,000 |  |
Other Assets | Fair Value, Inputs, Level 1 [Member] | US Treasury Securities |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement | 6,496,000 | 4,695,000 |  |
Other Assets | Fair Value, Inputs, Level 1 [Member] | Corporate Bond Securities |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement | 0 | 0 |  |
Other Assets | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement | 0 | 0 |  |
Other Assets | Fair Value, Inputs, Level 2 [Member] | Corporate Bond Securities |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement | 11,080,000 | 9,710,000 |  |
Other Current Assets |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement | 17,576,000 | 14,405,000 |  |
Other Current Assets | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement | 6,496,000 | 4,695,000 |  |
Other Current Assets | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement | 11,080,000 | 9,710,000 |  |
Other Current Liabilities | Swap |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Financial Instruments, Owned, at Fair Value | 13,920,000 |  |  |
Other Current Liabilities | Fair Value, Inputs, Level 1 [Member] | Swap |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Financial Instruments, Owned, at Fair Value | 0 |  |  |
Other Current Liabilities | Fair Value, Inputs, Level 2 [Member] | Swap |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Financial Instruments, Owned, at Fair Value | 13,920,000 |  |  |
Kansas Gas Service Securitization I LLC |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Restricted Cash and Cash Equivalents | 20,552,000 | 8,446,000 |  |
Accounts receivable, net | 5,133,000 | 4,862,000 |  |
Finite-Lived Intangible Assets, Net | 293,619,000 | 323,838,000 |  |
Current maturities of securitized utility tariff bonds | 27,430,000 | 20,716,000 |  |
Accounts payable | 394,000 | 3,204,000 |  |
Interest Payable | 7,207,000 | 2,202,000 |  |
Securitized utility tariff bonds | 282,506,000 | 309,343,000 |  |
Stockholders' Equity Attributable to Parent | 1,768,000 | 1,681,000 |  |
Revenues | 48,677,000 | 5,769,000 |  |
Utilities Operating Expense | (440,000) | (52,000) |  |
Depreciation and amortization | (30,200,000) | (3,500,000) |  |
Interest Income, Other | 696,000 | 6,000 |  |
Interest Expense | (18,552,000) | (2,202,000) |  |
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | 162,000 | $ 0 |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Two | 29,391,000 |  |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Three | 31,025,000 |  |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Four | 32,751,000 |  |  |
Finite-Lived Intangible Asset, Expected Amortization, Year Five | 34,572,000 |  |  |
Finite-Lived Intangible Asset, Expected Amortization, Year One | $ 27,843,000 |  |  |

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