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Supplemental Balance Sheet, Income Statement and Cash Flow Information - Accrued Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Accrued liabilities |  |
Accrued compensation | $ 116,775 | $ 120,204
Deferred revenue | 255,626 | 340,472
Other taxes payable | 16,419 | 39,850
Workers' compensation liabilities | 18,255 | 37,459
Interest payable | 57,233 | 62,776
Litigation reserves | 24,896 | 27,097
Current liability to discontinued operations | 5,462 | 5,197
Dividends declared and payable | 17,039 |
Current liability to acquisition of KVS |  | 22,278
Other accrued liabilities | 31,543 | 31,280
Accrued liabilities | $ 543,248 | $ 686,613

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