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EMPLOYEE BENEFIT PLANS (Tables)

3 Months Ended

Mar. 31, 2017

Employee Benefit Plans [Line Items]

Schedule of Net Benefit Costs [Table Text Block]

The following tables set forth the components of net periodic benefit cost for our pension and other postemployment benefit plans for the periods indicated:



	Pension Benefits
	Three Months Ended
	March 31,
	2017			2016
	(Thousands of dollars)
Components of net periodic benefit cost
Service cost	$	3,044		$	3,014
Interest cost	10,113			11,387
Expected return on assets	(14,624		)	(15,296		)
Amortization of net loss	9,027			8,886
Net periodic benefit cost	$	7,560		$	7,991



	Other Postemployment Benefits
	Three Months Ended
	March 31,
	2017			2016
	(Thousands of dollars)
Components of net periodic benefit cost
Service cost	$	627		$	638
Interest cost	2,472			2,627
Expected return on assets	(3,147		)	(3,071		)
Amortization of unrecognized prior service cost	(1,149		)	(908		)
Amortization of net loss	1,621			1,151
Net periodic benefit cost	$	424		$	437