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FAIR VALUE MEASUREMENTS - Part 1 (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash held - offsetting derivative net asset positions under master-netting arrangements | $ 0 | $ 0
Cash posted - total | 13,300 | 8,800
Long-term debt, Fair Value | 15,000,000 | 13,800,000
Long-term debt | 14,300,000 | 12,500,000
Fair Value, Recurring [Member] |  |
Derivative assets |  |
Derivative assets | 28,445 | 38,442
Derivative assets netting | (52,719) | (28,588)
Derivative liabilities |  |
Derivative liabilities | (245,244) | (202,949)
Derivative liabilities netting | 52,719 | 28,588
Fair Value, Recurring [Member] | Financial Contracts [Member] |  |
Derivative assets |  |
Derivative assets | 28,445 | 37,861
Derivative assets netting | (52,719) | (28,588)
Derivative liabilities |  |
Derivative liabilities | (4,039) | (1,008)
Derivative liabilities netting | 52,719 | 28,588
Fair Value, Recurring [Member] | Interest-rate contracts |  |
Derivative assets |  |
Interest-rate contracts |  | 581
Derivative assets netting |  | 0
Derivative liabilities |  |
Interest rate derivative liabilities, at fair value | (241,205) | (201,941)
Derivative liabilities netting | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 29,175 | 10,892
Derivative liability, fair value, gross | (10,352) | (4,811)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Financial Contracts [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 29,175 | 10,892
Derivative liability, fair value, gross | (10,352) | (4,811)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest-rate contracts |  |
Derivative assets |  |
Interest-rate contracts |  | 0
Derivative liabilities |  |
Interest rate derivative liabilities, at fair value | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 0 | 581
Derivative liability, fair value, gross | (241,205) | (201,941)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Financial Contracts [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 0 | 0
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 |  | 581
Derivative liabilities |  |
Interest rate derivative liabilities, at fair value | (241,205) | (201,941)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 51,989 | 55,557
Derivative liability, fair value, gross | (46,406) | (24,785)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Financial Contracts [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 51,989 | 55,557
Derivative liability, fair value, gross | (46,406) | (24,785)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest-rate contracts |  |
Derivative assets |  |
Interest-rate contracts |  | 0
Derivative liabilities |  |
Interest rate derivative liabilities, at fair value | 0 | 0
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 81,164 | 67,030
Derivative liability, fair value, gross | (297,963) | (231,537)
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Financial Contracts [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 81,164 | 66,449
Derivative liability, fair value, gross | (56,758) | (29,596)
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Interest-rate contracts |  |
Derivative assets |  |
Interest-rate contracts |  | 581
Derivative liabilities |  |
Interest rate derivative liabilities, at fair value | $ (241,205) | $ (201,941)

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