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Supplemental Balance Sheet, Income Statement and Cash Flow Information - Accrued Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Accrued liabilities |  |
Accrued compensation | $ 130,970 | $ 116,775
Deferred revenue | 218,370 | 255,626
Other taxes payable | 32,095 | 16,419
Workers' compensation liabilities | 13,987 | 18,255
Interest payable | 65,642 | 57,233
Litigation reserves | 18,830 | 24,896
Current liability to discontinued operations | 6,074 | 5,462
Dividends declared and payable | 17,148 | 17,039
Other accrued liabilities | 29,928 | 31,543
Accrued liabilities | $ 533,044 | $ 543,248

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