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Accrued Liabilities and Other and Other Long-Term Liabilities Accrued Liabilities and Other and Other Long-Term Liabilities - Schedule of Other Long-Term Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Contract with Customer, Liability, Noncurrent | $ 21,567 | $ 23,732 |  |
Asset Retirement Obligations, Noncurrent | 10,839 | 37,996 |  |
Liability, Defined Benefit Pension Plan, Noncurrent | 10,267 | 9,172 |  |
Derivative Liability, Noncurrent | 29,130 | 33,566 |  |
Unrecognized Tax Benefits | 71,008 | 70,738 | $ 51,001 | $ 62,958
Long-term operating lease liabilities (note 5) | 105 | 29,182 |  |
Other Sundry Liabilities, Noncurrent | 3,860 | 1,689 |  |
Other long-term liabilities | 168,877 | 198,107 |  |
Other Long-term Liabilities |  |  |  |
Guarantee Liability Non Current | 10,741 | 11,818 |  |
Unrecognized Tax Benefits | 71,008 | 70,738 |  |
Office Building [Member] |  |  |  |
Long-term operating lease liabilities (note 5) | $ 11,465 | $ 9,396 |  |

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