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PROPERTY, PLANT AND EQUIPMENT (Tables)
 12 Months Ended
Dec. 31, 2018
Regulated [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment by Property Type
The following table sets forth our property, plant and equipment by property type, for the periods indicated:
 
 
December 31,
 
December 31,
 
 
2018
 
2017
 
 
(Thousands of dollars)
Natural gas distribution pipelines and related equipment
 
$
4,861,340

 
$
4,572,343

Natural gas transmission pipelines and related equipment
 
517,697

 
497,791

General plant and other
 
567,580

 
513,445

Construction work in process
 
126,526

 
130,333

Property, plant and equipment
 
6,073,143

 
5,713,912

Accumulated depreciation and amortization
 
(1,789,431
)
 
(1,706,327
)
Net property, plant and equipment
 
$
4,283,712

 
$
4,007,585