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FAIR VALUE MEASUREMENTS - Part 1 (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash held - offsetting derivative net asset positions under master-netting arrangements | $ 0 | $ 0
Cash posted - total | 108,000 | 63,100
Cash posted - offsetting derivative net liability positions under master-netting arrangements | 54,400 | 35,100
Cash posted - remaining in excess of derivative net liability positions included in consolidated Balance Sheets | 53,600 | 28,000
Long-term debt, fair value | 15,800,000 | 16,300,000
Long-term debt | 14,200,000 | 14,200,000
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 120,397 | 110,498
Derivative liabilities |  |
Derivative liability, fair value, gross | (271,919) | (349,018)
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member] | Financial Contracts |  |
Derivative assets |  |
Derivative asset, fair value, gross | 120,156 | 110,498
Derivative liabilities |  |
Derivative liability, fair value, gross | (174,556) | (145,611)
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member] | Interest Rate Contracts |  |
Derivative assets |  |
Interest-rate contracts | 241 |
Derivative liabilities |  |
Interest-rate contracts | (97,363) | (203,407)
Fair Value, Recurring [Member] |  |
Derivative assets |  |
Derivative assets | 241 | 0
Derivative assets netting | (120,156) | (110,498)
Derivative liabilities |  |
Derivative liabilities | (97,363) | (203,407)
Derivative liabilities netting | 174,556 | 145,611
Fair Value, Recurring [Member] | Financial Contracts |  |
Derivative assets |  |
Derivative assets | 0 | 0
Derivative assets netting | (120,156) | (110,498)
Derivative liabilities |  |
Derivative liabilities | 0 | 0
Derivative liabilities netting | 174,556 | 145,611
Fair Value, Recurring [Member] | Interest Rate Contracts |  |
Derivative assets |  |
Interest-rate contracts | 241 |
Derivative assets netting | 0 |
Derivative liabilities |  |
Interest-rate contracts | (97,363) | (203,407)
Derivative liabilities netting | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 6,380 | 6,697
Derivative liabilities |  |
Derivative liability, fair value, gross | (18,986) | (10,489)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Financial Contracts |  |
Derivative assets |  |
Derivative asset, fair value, gross | 6,380 | 6,697
Derivative liabilities |  |
Derivative liability, fair value, gross | (18,986) | (10,489)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Contracts |  |
Derivative assets |  |
Interest-rate contracts | 0 |
Derivative liabilities |  |
Interest-rate contracts | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 241 | 0
Derivative liabilities |  |
Derivative liability, fair value, gross | (97,363) | (203,407)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Financial Contracts |  |
Derivative assets |  |
Derivative asset, fair value, gross | 0 | 0
Derivative liabilities |  |
Derivative liability, fair value, gross | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Contracts |  |
Derivative assets |  |
Interest-rate contracts | 241 |
Derivative liabilities |  |
Interest-rate contracts | (97,363) | (203,407)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 113,776 | 103,801
Derivative liabilities |  |
Derivative liability, fair value, gross | (155,570) | (135,122)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Financial Contracts |  |
Derivative assets |  |
Derivative asset, fair value, gross | 113,776 | 103,801
Derivative liabilities |  |
Derivative liability, fair value, gross | (155,570) | (135,122)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Contracts |  |
Derivative assets |  |
Interest-rate contracts | 0 |
Derivative liabilities |  |
Interest-rate contracts | $ 0 | $ 0

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