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Supplemental Balance Sheet, Income Statement and Cash Flow Information - Accrued Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accrued liabilities |  |
Accrued compensation | $ 82,462 | $ 97,003
Deferred revenue and proceeds on insurance and asset sales | 61,473 | 89,051
Other taxes payable | 28,602 | 31,472
Workers' compensation liabilities | 7,788 | 30,214
Interest payable | 62,935 | 51,316
Litigation reserves | 13,976 | 14,736
Dividends declared and payable | 3,653 | 7,832
Other accrued liabilities | 15,196 | 11,658
Accrued liabilities | $ 276,085 | $ 333,282

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