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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - INTANGIBLE ASSETS (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
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