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FINANCIAL INSTRUMENTS - Fair Values (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Oct. 31, 2018 | Dec. 31, 2017 | Dec. 03, 2017
Carrying Value and Estimated Fair Values |  |  |  |
Cash collateral | $ 486,426,000 |  | $ 397,815,000 |
Derivative asset | 95,500,000 |  | 112,317,000 |
Derivative liability | 72,126,000 |  | 40,364,000 |
Debt Issuance Costs, Net | 16,837,000 |  | 24,053,000 |
Gross amounts presented in the consolidated balance sheet, Total asset derivatives | 10,770,000 |  | 10,166,000 |
Gross amounts not offset in the consolidated balance sheet subject to netting agreements | 0 |  | 0 |
Net amount, Total asset derivatives | 10,770,000 |  | 10,166,000 |
Energy Related Derivative |  |  |  |
Carrying Value and Estimated Fair Values |  |  |  |
Derivative asset | 84,730,000 |  | 94,700,000 |
Derivative liability |  |  |  | $ 79,600,000
Interest rate swap |  |  |  |
Carrying Value and Estimated Fair Values |  |  |  |
Derivative asset | 6,298,000 |  | 10,166,000 |
Equity Swap |  |  |  |
Carrying Value and Estimated Fair Values |  |  |  |
Derivative liability | 70,804,000 |  | 40,141,000 |
Currency swap |  |  |  |
Carrying Value and Estimated Fair Values |  |  |  |
Derivative asset |  |  | 51,000 |
Derivative liability | 1,322,000 |  | 223,000 |
Earn-Out Units |  |  |  |
Carrying Value and Estimated Fair Values |  |  |  |
Derivative asset | 0 |  | 7,400,000 |
Level 1 | Carrying value |  |  |  |
Carrying Value and Estimated Fair Values |  |  |  |
Cash and cash equivalents | 217,835,000 |  | 214,862,000 |
Restricted cash and short-term deposits | 486,426,000 |  | 397,815,000 |
Level 1 | Fair value |  |  |  |
Carrying Value and Estimated Fair Values |  |  |  |
Cash and cash equivalents | 217,835,000 |  | 214,862,000 |
Restricted cash and short-term deposits | 486,426,000 |  | 397,815,000 |
Level 2 | Carrying value |  |  |  |
Carrying Value and Estimated Fair Values |  |  |  |
Current portion of long-term debt | (732,184,000) |  | (1,393,229,000) |
Long-term debt - convertible bond | (353,661,000) |  | (340,173,000) |
Long-term debt | (1,496,351,000) |  | (701,498,000) |
Level 2 | Carrying value | Energy Related Derivative |  |  |  |
Carrying Value and Estimated Fair Values |  |  |  |
Derivative asset | 84,730,000 |  | 94,700,000 |
Level 2 | Carrying value | Interest rate swap |  |  |  |
Carrying Value and Estimated Fair Values |  |  |  |
Derivative asset | 10,770,000 |  | 10,166,000 |
Level 2 | Carrying value | Equity Swap |  |  |  |
Carrying Value and Estimated Fair Values |  |  |  |
Derivative liability | 70,804,000 |  | 40,141,000 |
Level 2 | Carrying value | Currency swap |  |  |  |
Carrying Value and Estimated Fair Values |  |  |  |
Foreign exchange swaps asset | 0 |  | 51,000 |
Foreign exchange swaps liability | (1,322,000) |  | (223,000) |
Level 2 | Carrying value | Earn-Out Units |  |  |  |
Carrying Value and Estimated Fair Values |  |  |  |
Derivative asset | 0 | $ 0 | 7,400,000 |
Level 2 | Fair value |  |  |  |
Carrying Value and Estimated Fair Values |  |  |  |
Current portion of long-term debt | (732,184,000) |  | (1,393,229,000) |
Long-term debt - convertible bond | (373,029,000) |  | (430,361,000) |
Long-term debt | (1,496,351,000) |  | (701,498,000) |
Level 2 | Fair value | Energy Related Derivative |  |  |  |
Carrying Value and Estimated Fair Values |  |  |  |
Derivative asset | 84,730,000 |  | 94,700,000 |
Level 2 | Fair value | Interest rate swap |  |  |  |
Carrying Value and Estimated Fair Values |  |  |  |
Derivative asset | 10,770,000 |  | 10,166,000 |
Level 2 | Fair value | Equity Swap |  |  |  |
Carrying Value and Estimated Fair Values |  |  |  |
Derivative liability | 70,804,000 |  | 40,141,000 |
Level 2 | Fair value | Currency swap |  |  |  |
Carrying Value and Estimated Fair Values |  |  |  |
Foreign exchange swaps asset | 0 |  | 51,000 |
Foreign exchange swaps liability | (1,322,000) |  | (223,000) |
Level 2 | Fair value | Earn-Out Units |  |  |  |
Carrying Value and Estimated Fair Values |  |  |  |
Derivative asset | 0 |  | $ 7,400,000 |
Share Repurchase Forward Swap |  |  |  |
Carrying Value and Estimated Fair Values |  |  |  |
Cash collateral | $ 82,900,000 |  |  |
Collateral required under share repurchase agreement, percentage of total purchase price | 20.00% |  |  |

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