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REVENUE Timing of Revenue Recognition - Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | ---
Customer accounts receivable |  |  |
Billed |  | $ 318,108 | $ 205,490
Unbilled revenues |  | 55,155 | 7,199
Customers' credit |  | (29,629) | (27,325)
Customers accounts receivables & Customers' credit balances and deposits |  | 343,634 |
Natural Gas Distribution |  |  |
Customer accounts receivable |  |  |
Billed | [1] | 73,748 | 39,151
Clean Energy Ventures |  |  |
Customer accounts receivable |  |  |
Billed |  | 3,574 | 3,330
Energy Services |  |  |
Customer accounts receivable |  |  |
Billed |  | 237,790 | $ 157,936
Operating Segments | Natural Gas Distribution |  |  |
Customer accounts receivable |  |  |
Billed |  | 73,748 |
Unbilled revenues |  | 55,155 |
Customers' credit |  | (29,627) |
Customers accounts receivables & Customers' credit balances and deposits |  | 99,276 |
Operating Segments | Clean Energy Ventures |  |  |
Customer accounts receivable |  |  |
Billed |  | 3,574 |
Unbilled revenues |  | 0 |
Customers' credit |  | 0 |
Customers accounts receivables & Customers' credit balances and deposits |  | 3,574 |
Operating Segments | Energy Services |  |  |
Customer accounts receivable |  |  |
Billed |  | 239,542 |
Unbilled revenues |  | 0 |
Customers' credit |  | 0 |
Customers accounts receivables & Customers' credit balances and deposits |  | 239,542 |
Home Services and Other |  |  |
Customer accounts receivable |  |  |
Billed |  | 2,996 |
Unbilled revenues |  | 0 |
Customers' credit |  | (2) |
Customers accounts receivables & Customers' credit balances and deposits |  | 2,994 |
Eliminations |  |  |
Customer accounts receivable |  |  |
Billed |  | 1,752 |
Unbilled revenues |  | 0 |
Customers' credit |  | 0 |
Customers accounts receivables & Customers' credit balances and deposits |  | $ 1,752 |
[1] | Does not include unbilled revenues of $55.2 million and $7.2 million as of December 31, 2018 and September 30, 2018, respectively.

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