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FAIR VALUE MEASUREMENTS - Part 1 (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
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 | 800 | 49,700
Cash posted - offsetting derivative net liability positions under master-netting arrangements | 0 | 29,500
Cash posted - remaining in excess of derivative net liability positions included in consolidated Balance Sheets |  | 20,200
Long-term Debt, Fair Value | 9,600,000 | 9,300,000
Long-term Debt | 9,400,000 | 8,500,000
Fair Value, Measurements, Recurring [Member] |  |
Derivative assets |  |
Financial contracts | 47,238 | 0
Physical contracts | 1,142 |
Interest-rate contracts | 19,005 | 49,960
Total derivative assets | 67,385 | 49,960
Derivative assets netting | (32,739) | (24,455)
Derivative Liabilities |  |
Financial contracts | 0 | (32)
Physical contracts |  | (4,781)
Interest-rate contracts | (99,260) |
Total derivative liabilities | (99,260) | (4,813)
Derivative liabilities netting | 32,739 | 53,936
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivative assets |  |
Financial contracts | 79,977 | 24,455
Physical contracts | 1,142 |
Interest-rate contracts | 19,005 | 49,960
Total derivative assets | 100,124 | 74,415
Derivative Liabilities |  |
Financial contracts | (32,739) | (53,968)
Physical contracts |  | (4,781)
Interest-rate contracts | (99,260) |
Total derivative liabilities | (131,999) | (58,749)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Derivative assets |  |
Financial contracts | 10,812 | 4,252
Physical contracts | 0 |
Interest-rate contracts | 0 | 0
Total derivative assets | 10,812 | 4,252
Derivative Liabilities |  |
Financial contracts | (2,916) | (5,708)
Physical contracts |  | 0
Interest-rate contracts | 0 |
Total derivative liabilities | (2,916) | (5,708)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Derivative assets |  |
Financial contracts | 0 | 0
Physical contracts | 0 |
Interest-rate contracts | 19,005 | 49,960
Total derivative assets | 19,005 | 49,960
Derivative Liabilities |  |
Financial contracts | 0 | 0
Physical contracts |  | 0
Interest-rate contracts | (99,260) |
Total derivative liabilities | (99,260) | 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Derivative assets |  |
Financial contracts | 69,165 | 20,203
Physical contracts | 1,142 |
Interest-rate contracts | 0 | 0
Total derivative assets | 70,307 | 20,203
Derivative Liabilities |  |
Financial contracts | (29,823) | (48,260)
Physical contracts |  | (4,781)
Interest-rate contracts | 0 |
Total derivative liabilities | $ (29,823) | $ (53,041)

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