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Assets Held for Sale and Discontinued Operations (Major Categories of Assets and Liabilities Reflected as Held for Sale) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Current liabilities |  |
Total current liabilities associated with assets held for sale | $ 0 | $ 14,372
Discontinued operations, held-for-sale or disposed of by sale | Brunei Exploration And Production Operations |  |
Current assets |  |
Cash | 0 | 10,185
Inventories | 0 | 406
Property, plant, and equipment, net | 40,820 | 307,704
Deferred income taxes and other assets | 0 | 9,441
Total current assets associated with assets held for sale | 40,820 | 327,736
Current liabilities |  |
Accounts payable | 0 | 5,306
Other accrued liabilities | 0 | 45
Current maturities of long-term debt (finance lease) | 0 | 737
Taxes payable | 0 | 1,510
Long-term debt (finance lease) | 0 | 6,513
Asset retirement obligation | 0 | 261
Total current liabilities associated with assets held for sale | $ 0 | $ 14,372

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