Annual report pursuant to Section 13 and 15(d)

Accrued Liabilities (Details)

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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Compensation and bonus $ 49,988 $ 47,823
Interest 15,936 9,139
Property tax 1,622 2,499
Environmental reserves (see Note 22) 5,790 8,346
Supply contract obligation (see Note 25) 1,638 1,638
Income taxes 1,166 8,035
Commissions and rebates 1,820 2,253
Pension, postretirement and supplemental retirement plans (see Note 19) 2,192 2,030
Other 13,765 17,670
Total $ 93,917 $ 99,433