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Supplemental Balance Sheet and Income Statement Information - Accrued Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accrued liabilities |  |
Accrued compensation | $ 74,104 | $ 92,358
Deferred revenue | 95,100 | 116,700
Deferred revenue and proceeds on insurance and asset sales | 125,777 | 149,266
Other taxes payable | 15,460 | 33,199
Workers' compensation liabilities | 15,214 | 16,316
Interest payable | 18,982 | 59,718
Litigation reserves | 20,494 | 24,926
Current liability to discontinued operations | 999 | 2,445
Dividends declared and payable | 3,514 | 25,330
Other accrued liabilities | 23,515 | 14,354
Accrued liabilities | $ 298,059 | $ 417,912

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