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v3.19.3.a.u2

FAIR VALUE MEASUREMENTS - Part 1 (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
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 | 8,800 | 800
Cash posted - offsetting derivative net liability positions under master-netting arrangements | 0 | 0
Long-term Debt, Fair Value | 13,800,000 | 9,600,000
Long-term Debt | 12,500,000 | 9,400,000
Fair Value, Recurring [Member] |  |
Derivative assets |  |
Financial contracts | 37,861 | 47,238
Physical contracts |  | 1,142
Interest-rate contracts | 581 | 19,005
Total derivative assets | 38,442 | 67,385
Derivative assets netting | (28,588) | (32,739)
Derivative Liabilities |  |
Financial contracts | (1,008) | 0
Interest-rate contracts | (201,941) | (99,260)
Total derivative liabilities | (202,949) | (99,260)
Derivative liabilities netting | 28,588 | 32,739
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member] |  |
Derivative assets |  |
Financial contracts | 66,449 | 79,977
Physical contracts |  | 1,142
Interest-rate contracts | 581 | 19,005
Total derivative assets | 67,030 | 100,124
Derivative Liabilities |  |
Financial contracts | (29,596) | (32,739)
Interest-rate contracts | (201,941) | (99,260)
Total derivative liabilities | (231,537) | (131,999)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Derivative assets |  |
Financial contracts | 10,892 | 10,812
Physical contracts |  | 0
Interest-rate contracts | 0 | 0
Total derivative assets | 10,892 | 10,812
Derivative Liabilities |  |
Financial contracts | (4,811) | (2,916)
Interest-rate contracts | 0 | 0
Total derivative liabilities | (4,811) | (2,916)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Derivative assets |  |
Financial contracts | 0 | 0
Physical contracts |  | 0
Interest-rate contracts | 581 | 19,005
Total derivative assets | 581 | 19,005
Derivative Liabilities |  |
Financial contracts | 0 | 0
Interest-rate contracts | (201,941) | (99,260)
Total derivative liabilities | (201,941) | (99,260)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Derivative assets |  |
Financial contracts | 55,557 | 69,165
Physical contracts |  | 1,142
Interest-rate contracts | 0 | 0
Total derivative assets | 55,557 | 70,307
Derivative Liabilities |  |
Financial contracts | (24,785) | (29,823)
Interest-rate contracts | 0 | 0
Total derivative liabilities | (24,785) | (29,823)
Interest Rate Contract | Fair Value, Recurring [Member] |  |
Derivative assets |  |
Derivative assets netting | 0 | 0
Derivative Liabilities |  |
Derivative liabilities netting | 0 | 0
Physical Contracts [Member] | Fair Value, Recurring [Member] |  |
Derivative assets |  |
Derivative assets netting |  | 0
Financial contracts | Fair Value, Recurring [Member] |  |
Derivative assets |  |
Derivative assets netting | (28,588) | (32,739)
Derivative Liabilities |  |
Derivative liabilities netting | $ 28,588 | $ 32,739

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