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Supplemental Balance Sheet and Income Statement Information - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Accrued liabilities    
Accrued compensation $ 74,576 $ 97,003
Deferred revenue and proceeds on insurance and asset sales 79,622 89,051
Other taxes payable 22,660 31,472
Workers' compensation liabilities 15,214 30,214
Interest payable 25,065 51,316
Litigation reserves 14,163 14,736
Dividends declared and payable 7,175 7,832
Other accrued liabilities 14,189 11,658
Accrued liabilities $ 252,664 $ 333,282