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EMPLOYEE BENEFIT PLANS Schedule of Net Benefit Costs (Tables)
6 Months Ended
Jun. 30, 2017
Postemployment Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
The following table reflects the components of net periodic benefit costs for the defined benefit plans:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
(In thousands of dollars)
2017
 
2016
 
2017
 
2016
Service cost
$
1,049

 
$
990

 
$
2,116

 
$
1,913

Interest cost
945

 
993

 
1,907

 
1,918

Expected return on plan assets
(1,343
)
 
(1,372
)
 
(2,711
)
 
(2,651
)
Recognized actuarial gain
(48
)
 
(11
)
 
(97
)
 
(20
)
Net periodic benefit cost
$
603

 
$
600

 
$
1,215

 
$
1,160