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Balance Sheet Components - Other Current Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Balance Sheet Related Disclosures [Abstract] |  |
Accrued taxes other than income taxes | $ 42,945 | $ 45,099
Derivative liabilities | 24,797 | 14,008
Employee paid time off accruals | 28,321 | 26,495
Accrued interest | 29,278 | 17,083
Pensions and other postretirement benefits | 10,970 | 11,987
Other | 35,417 | 35,159
Total other current liabilities | $ 171,728 | $ 149,831

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