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Balance Sheet Components - Other Current Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Balance Sheet Related Disclosures [Abstract] |  |
Accrued taxes other than income taxes | $ 41,136 | $ 36,965
Employee paid time off accruals | 25,796 | 22,343
Accrued interest | 29,608 | 16,486
Current portion of pensions and other postretirement benefits | 9,202 | 8,826
Derivative liabilities | 4,398 | 10,928
Other current liabilities | 30,100 | 35,431
Total other current liabilities | $ 140,240 | $ 130,979

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- Definition Current liabilities attributable to energy marketing activities (trading activities). Current energy marketing (trading activities) are when entities engage in both financial and physical trading to increase profits, manage their commodity price risk and enhance system reliability. They may trade electricity, coal, natural gas and oil. These entities typically use a variety of financial instruments, including forward contracts, options and swaps. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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