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OTHER BALANCE SHEET INFORMATION - Other Current Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Other current liabilities:    
Accrued payroll, taxes and employee benefits $ 20,206 $ 19,346
Accrued operating expenditures 14,041 15,861
Income, sales, use and other taxes 4,781 8,911
Self-insurance reserve 26,991 25,358
Accrued interest 6,769 7,105
Accrued insurance premiums 1,730 5,651
Unsettled legal claims 2,645 4,356
Accrued severance 0 83
Operating leases 2,359 0
Other 2,629 706
Total $ 82,151 $ 87,377