Accrued and Other Current Liabilities

12 Months Ended

Dec. 31, 2018

Payables and Accruals [Abstract]

Accrued and Other Current Liabilities

ACCRUED AND OTHER CURRENT LIABILITIES

Accrued and other current liabilities as of December 31 consisted of the following:

	2018		2017
	(Thousands of dollars)
Salaries & wages	$	9,130	$	6,240
Incentive compensation	5,226		8,991
Income taxes	895		930
Interest	7,774		8,108
Vacation payable	8,838		7,619
Group medical	1,755		1,344
Transportations tax	301		971
Operating lease	658		710
Workers compensation	846		959
Other	9,869		5,978
Total accrued liabilities	$	45,292	$	41,850