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DERIVATIVE INSTRUMENTS - BALANCE SHEET RELATED DISCLOSURES (Details) - USD ($) $ in Thousands |  | 3 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 13, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2018 | May 30, 2018 | May 15, 2018 | May 11, 2018 | Jan. 31, 2018 | Jun. 30, 2015
Fair Value |  |  |  |  |  |  |  |  |
Derivative assets, current |  | $ 55,358 |  | $ 27,396 |  |  |  |  |
Derivative liabilities, current |  | 65,114 |  | 46,652 |  |  |  |  |
Derivative assets, noncurrent |  | 6,085 |  | 10,560 |  |  |  |  |
Derivative liabilities, noncurrent |  | 36,825 |  | 22,982 |  |  |  |  |
Interest rate swap |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Benchmark interest rate |  |  |  |  |  |  |  | 2.84% |
Treasury lock |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Benchmark interest rate |  |  |  |  |  |  |  |  | 3.26%
Interest rate, stated percentage |  |  |  |  |  |  | 4.01% |  |
Gain (loss) on derivative, net | $ 2,600 |  |  |  |  |  |  |  |
Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Gain (loss) on derivative, net |  | 10,389 | $ 47,532 |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |
Derivative assets |  | 61,443 |  | 37,956 |  |  |  |  |
Derivative liabilities |  | 101,939 |  | 69,634 |  |  |  |  |
Natural Gas Distribution | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Gain (loss) on derivative, net |  | (7,373) | 15,851 |  |  |  |  |  |
Natural Gas Distribution | Not Designated as Hedging Instrument | Physical commodity contracts |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Gain (loss) on derivative, net |  | (2,977) | 2,976 |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |
Derivative assets, current |  | 1,555 |  | 85 |  |  |  |  |
Derivative liabilities, current |  | 325 |  | 192 |  |  |  |  |
Natural Gas Distribution | Not Designated as Hedging Instrument | Financial commodity contracts |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Gain (loss) on derivative, net |  | (4,396) | 8,808 |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |
Derivative assets, current |  | 3,529 |  | 94 |  |  |  |  |
Derivative liabilities, current |  | 2,335 |  | 0 |  |  |  |  |
Natural Gas Distribution | Not Designated as Hedging Instrument | Interest rate contracts |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Gain (loss) on derivative, net |  | 0 | $ 4,067 |  |  |  |  |  |
Natural Gas Distribution | Series Ll |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  | $ 125,000 |  |  |
Interest rate, stated percentage |  |  |  |  |  | 5.60% |  |  |
Energy Services | Not Designated as Hedging Instrument | Physical commodity contracts |  |  |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |
Derivative assets, current |  | 10,626 |  | 7,667 |  |  |  |  |
Derivative liabilities, current |  | 26,976 |  | 18,158 |  |  |  |  |
Derivative assets, noncurrent |  | 1,255 |  | 3,930 |  |  |  |  |
Derivative liabilities, noncurrent |  | 19,947 |  | 11,316 |  |  |  |  |
Energy Services | Not Designated as Hedging Instrument | Financial commodity contracts |  |  |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |
Derivative assets, current |  | 39,409 |  | 19,169 |  |  |  |  |
Derivative liabilities, current |  | 35,219 |  | 28,176 |  |  |  |  |
Derivative assets, noncurrent |  | 4,830 |  | 6,630 |  |  |  |  |
Derivative liabilities, noncurrent |  | 16,618 |  | 11,548 |  |  |  |  |
Energy Services | Not Designated as Hedging Instrument | Foreign currency contracts |  |  |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |
Derivative assets, current |  | 0 |  | 0 |  |  |  |  |
Derivative liabilities, current |  | 259 |  | 126 |  |  |  |  |
Derivative assets, noncurrent |  | 0 |  | 0 |  |  |  |  |
Derivative liabilities, noncurrent |  | 260 |  | 118 |  |  |  |  |
First Mortgage | Natural Gas Distribution | Series VV |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  | $ 125,000 |  | $ 125,000 |  |
Term Loan | Credit Agreement Due August 16, 2019 | Interest rate swap |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  | $ 100,000 |
Home Services and Other | Not Designated as Hedging Instrument | Interest rate contracts |  |  |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |
Derivative assets, current |  | 239 |  | 381 |  |  |  |  |
Derivative liabilities, current |  | $ 0 |  | $ 0 |  |  |  |  |

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