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Financial Instruments (Details) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 19, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | ---
Non-Derivatives: |  |  |  |  |
Cash and cash equivalents | $ 306,387,000 | $ 214,862,000 |  | $ 286,562,000 | $ 224,190,000
Restricted cash and short-term deposits | 457,776,000 | 397,815,000 |  |  |
Long-term debt | (1,788,669,000) | (1,025,914,000) |  |  |
Derivatives: |  |  |  |  |
Derivative asset | 16,225,000 | 10,166,000 |  |  |
Deferred finance charges | 17,080,000 | 24,053,000 |  |  |
Interest Rate Swap | Cash Flow Hedging |  |  |  |  |
Derivatives: |  |  |  |  |
Notional value | $ 1,250,000,000 |  |  |  |
Interest Rate Swap | Minimum | Cash Flow Hedging |  |  |  |  |
Derivatives: |  |  |  |  |
Fixed interest rates | 1.13% |  |  |  |
Interest Rate Swap | Maximum | Cash Flow Hedging |  |  |  |  |
Derivatives: |  |  |  |  |
Fixed interest rates | 1.94% |  |  |  |
Carrying value | Level 1 |  |  |  |  |
Non-Derivatives: |  |  |  |  |
Cash and cash equivalents | $ 306,387,000 | 214,862,000 |  |  |
Restricted cash and short-term deposits | 457,776,000 | 397,815,000 |  |  |
Carrying value | Level 2 |  |  |  |  |
Non-Derivatives: |  |  |  |  |
Debt, current | (833,691,000) | (1,393,229,000) |  |  |
Long-term debt - convertible bonds | (350,148,000) | (340,173,000) |  |  |
Long-term debt | (1,452,821,000) | (701,498,000) |  |  |
Carrying value | Level 2 | Interest Rate Swap |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative asset | 16,225,000 | 10,166,000 |  |  |
Carrying value | Level 2 | Foreign Exchange Swaps |  |  |  |  |
Derivatives: |  |  |  |  |
Foreign exchange swaps asset | 129,000 | 51,000 |  |  |
Foreign exchange swaps liability | (460,000) | (223,000) |  |  |
Carrying value | Level 2 | Return Equity Swap |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative liability | (50,899,000) | (40,141,000) |  |  |
Carrying value | Level 2 | Earn-out Units |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative asset | 0 | 7,400,000 |  |  |
Fair value | Level 1 |  |  |  |  |
Non-Derivatives: |  |  |  |  |
Cash and cash equivalents, fair value disclosure | 306,387,000 | 214,862,000 |  |  |
Restricted cash and cash equivalents, fair value disclosure | 457,776,000 | 397,815,000 |  |  |
Fair value | Level 2 |  |  |  |  |
Non-Derivatives: |  |  |  |  |
Debt, current, fair value disclosure | (833,691,000) | (1,393,229,000) |  |  |
Convertible debt, fair value disclosures | (420,653,000) | (430,361,000) |  |  |
Long-term debt, fair value | (1,452,821,000) | (701,498,000) |  |  |
Fair value | Level 2 | Interest Rate Swap |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative asset | 16,225,000 | 10,166,000 |  |  |
Fair value | Level 2 | Foreign Exchange Swaps |  |  |  |  |
Derivatives: |  |  |  |  |
Foreign exchange swaps asset | 129,000 | 51,000 |  |  |
Foreign exchange swaps liability | (460,000) | (223,000) |  |  |
Fair value | Level 2 | Return Equity Swap |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative liability | (50,899,000) | (40,141,000) |  |  |
Fair value | Level 2 | Earn-out Units |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative asset | 0 | 7,400,000 |  |  |
FLNG |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative asset |  | 79,600,000 | $ 79,600,000 |  |
Derivative liability |  | (79,600,000) |  |  |
FLNG | Carrying value | Level 2 | Interest Rate Swap |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative asset | 280,470,000 | 94,700,000 |  |  |
FLNG | Fair value | Level 2 | Interest Rate Swap |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative asset | $ 280,470,000 | $ 94,700,000 |  |  |

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