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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - INTANGIBLE ASSETS (Details) $ in Thousands | Sep. 30, 2018 USD ($)
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Business Acquisition [Line Items] |
2019 | $ 8,424
2020 | 4,925
2021 | 4,604
2022 | 2,561
2023 | 2,271
Thereafter | 77
Talen's Wholesale Natural Gas Energy Contracts |
Business Acquisition [Line Items] |
Internal use software costs | 513
Intangible assets, net of amortization | $ 22,900

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