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FAIR VALUE MEASUREMENTS - Part 1 (Details) - USD ($) $ in Thousands | Jun. 30, 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 | 52,600 | 49,700
Cash posted - offsetting derivative net liability positions under master-netting arrangements | 36,200 | 29,500
Cash posted - remaining in excess of derivative net liability positions included in consolidated Balance Sheets | 16,400 | 20,200
Long-term debt, Fair Value | 8,500,000 | 9,300,000
Long-term debt | 8,000,000 | 8,500,000
Fair Value, Measurements, Recurring [Member] |  |
Derivative assets |  |
Financial contracts | 0 | 0
Interest-rate contracts | 29,596 | 49,960
Total derivative assets | 29,596 | 49,960
Derivative assets netting | (24,121) | (24,455)
Derivative liabilities |  |
Financial contracts | 0 | (32)
Physical contracts | (1,854) | (4,781)
Interest-rate contracts | (5,290) |
Total derivative liabilities | (7,144) | (4,813)
Derivative liabilities netting | 60,323 | 53,936
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] |  |
Derivative assets |  |
Financial contracts | 24,121 | 24,455
Interest-rate contracts | 29,596 | 49,960
Total derivative assets | 53,717 | 74,415
Derivative liabilities |  |
Financial contracts | (60,323) | (53,968)
Physical contracts | (1,854) | (4,781)
Interest-rate contracts | (5,290) |
Total derivative liabilities | (67,467) | (58,749)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Derivative assets |  |
Financial contracts | 623 | 4,252
Interest-rate contracts | 0 | 0
Total derivative assets | 623 | 4,252
Derivative liabilities |  |
Financial contracts | (15,178) | (5,708)
Physical contracts | 0 | 0
Interest-rate contracts | 0 |
Total derivative liabilities | (15,178) | (5,708)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Derivative assets |  |
Financial contracts | 0 | 0
Interest-rate contracts | 29,596 | 49,960
Total derivative assets | 29,596 | 49,960
Derivative liabilities |  |
Financial contracts | 0 | 0
Physical contracts | 0 | 0
Interest-rate contracts | (5,290) |
Total derivative liabilities | (5,290) | 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Derivative assets |  |
Financial contracts | 23,498 | 20,203
Interest-rate contracts | 0 | 0
Total derivative assets | 23,498 | 20,203
Derivative liabilities |  |
Financial contracts | (45,145) | (48,260)
Physical contracts | (1,854) | (4,781)
Interest-rate contracts | 0 |
Total derivative liabilities | $ (46,999) | $ (53,041)

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