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DERIVATIVE CONTRACTS AND COLLATERALIZED INDEBTEDNESS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Derivative [Line Items] |  |  |  |
Gain (loss) on derivative contracts related to change in the value of equity derivative contracts related to Comcast common stock | $ (98,840) | $ (152,061) | $ (152,405) | $ 287,800
Change in the fair value of Comcast common stock included in gain (loss) on investments | 125,000 | 197,594 | 198,453 | (257,302)
Gain (loss) on interest rate swap contracts, net of a gain of $74,835 recorded in the six months 2020 period in connection with the early termination of the swap agreements discussed below | (21,574) | (33,735) | 54,079 | (88,567)
Notes related to derivative contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) on derivative contracts related to change in the value of equity derivative contracts related to Comcast common stock | $ (98,840) | $ (152,061) | $ (152,405) | $ 287,800

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