v3.20.4
ACCRUED LIABILITIES (Tables)
12 Months Ended
Dec. 31, 2020
Accrued Liabilities, Current [Abstract]
Schedule of Accrued Liabilities [Table Text Block]
Accrued liabilities consisted of the following:
December 31,
2020
2019
(Thousands of Dollars)
Employee wages and benefit costs
$
27,805
$
36,704
Revenue contract liabilities
22,019
21,083
Interest rate swaps
—
19,169
Operating lease liabilities
10,890
10,416
Environmental costs
5,371
4,837
Other
11,685
16,401
Accrued liabilities
$
77,770
$
108,610
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Tabular disclosure of the components of accrued liabilities.
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