Annual report pursuant to Section 13 and 15(d)

Accrued Liabilities (Details)

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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Compensation and bonus $ 52,296 $ 49,988
Interest 21,933 15,936
Property tax 3,018 1,622
Environmental reserves (see Note 23) 4,693 5,790
Supply contract obligation (see Note 25) 0 1,638
Income taxes 2,123 1,166
Commissions and rebates 1,798 1,820
Pension, postretirement and supplemental retirement plans (see Note 20) 2,439 2,192
Other 11,709 13,765
Total $ 100,009 $ 93,917