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FINANCIAL INSTRUMENTS - Fair Value Hierarchy (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Non-Derivatives: |  |  |  |
Cash and cash equivalents | $ 679,225 | $ 878,838 | $ 231,849 | $ 85,996
Trade accounts receivable | 38,915 | 41,545 |  |
Investment in listed equity securities (note 9) | 0 | 224,788 |  |
Current portion of long-term debt and short-term debt, carrying value | (342,566) | (344,778) |  |
Long-term debt, carrying value | (874,164) | (844,546) |  |
Derivatives: |  |  |  |
Deposits, money market deposits | 481,700 | 634,200 |  |
Interest income, money market deposits | 33,800 | 7,600 |  |
Deferred finance charges | 23,853 | 20,955 |  |
Interest rate swap |  |  |  |
Non-Derivatives: |  |  |  |
Interest receivable | 2,461 | 1,923 |  |
Commodity contract |  |  |  |
Non-Derivatives: |  |  |  |
Receivable from TTF linked commodity swap derivatives | 7,581 | 4,638 |  |
Derivatives: |  |  |  |
Mark-to-market derivative valuation | 48,079 | 73,583 |  |
Level 1 | Carrying value |  |  |  |
Non-Derivatives: |  |  |  |
Cash and cash equivalents | 679,225 | 878,838 |  |
Restricted cash and short-term deposits, carrying value | 92,245 | 134,043 |  |
Trade accounts receivable | 38,915 | 41,545 |  |
Money market funds, at carrying value | 3,929 | 3,617 |  |
Receivable from TTF linked commodity swap derivatives | 7,581 | 4,638 |  |
Interest receivable | 2,461 | 1,923 |  |
Investment in listed equity securities, carrying value | 0 | 224,788 |  |
Trade accounts payable, carrying value | (7,454) | (8,983) |  |
Unsecured long-term debt, noncurrent | (199,869) | (159,029) |  |
Level 1 | Fair value |  |  |  |
Non-Derivatives: |  |  |  |
Cash and cash equivalents, fair value | 679,225 | 878,838 |  |
Restricted cash and short-term deposits, fair value | 92,245 | 134,043 |  |
Trade accounts receivable, fair value | 38,915 | 41,545 |  |
Money market funds, fair value | 3,929 | 3,617 |  |
Other receivables, fair value disclosure | 7,581 | 4,638 |  |
Interest receivable, fair value | 2,461 | 1,923 |  |
Investment in listed equity securities (note 9) | 0 | 224,788 |  |
Trade accounts payable, fair value | (7,454) | (8,983) |  |
Unsecured long-term debt, noncurrent, fair value | (197,906) | (158,092) |  |
Level 2 | Carrying value |  |  |  |
Non-Derivatives: |  |  |  |
Assets held for sale | 0 | 721 |  |
Liabilities held for sale | 0 | (373) |  |
Current portion of long-term debt and short-term debt, carrying value | (343,781) | (344,960) |  |
Long-term debt, carrying value | (696,933) | (706,290) |  |
Level 2 | Carrying value | Energy related derivative |  |  |  |
Derivatives: |  |  |  |
Mark-to-market derivative valuation | 159,611 | 378,979 |  |
Level 2 | Carrying value | Interest rate swap |  |  |  |
Derivatives: |  |  |  |
Mark-to-market derivative valuation | 39,387 | 54,970 |  |
Level 2 | Carrying value | Commodity contract |  |  |  |
Derivatives: |  |  |  |
Mark-to-market derivative valuation | 48,079 | 113,368 |  |
Level 2 | Fair value |  |  |  |
Non-Derivatives: |  |  |  |
Assets held-for-sale, fair value | 0 | 721 |  |
Liabilities held for sale, fair value | 0 | (373) |  |
Current portion of long-term debt and short-term debt, fair value | (343,781) | (344,960) |  |
Long-term debt, fair value | (696,933) | (706,290) |  |
Level 2 | Fair value | Energy related derivative |  |  |  |
Derivatives: |  |  |  |
Mark-to-market derivative valuation | 159,611 | 378,979 |  |
Level 2 | Fair value | Interest rate swap |  |  |  |
Derivatives: |  |  |  |
Mark-to-market derivative valuation | 39,387 | 54,970 |  |
Level 2 | Fair value | Commodity contract |  |  |  |
Derivatives: |  |  |  |
Mark-to-market derivative valuation | $ 48,079 | $ 113,368 |  |

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- Definition Carrying value as of the balance sheet date of obligations incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483467/210-10-45-8 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483467/210-10-45-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-4 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482925/835-30-45-3 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1D -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1D + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References No definition available. + Details
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- Definition Amount due from parties in nontrade transactions, classified as other. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(5)(a)(5)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)(a)(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-8 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-4 + Details
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