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PROPERTY, PLANT AND EQUIPMENT
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment, at cost, consisted of the following:
 
Estimated Useful Lives
 
December 31,
 
 
2017
 
2016
 
(Years)
 
(Thousands of Dollars)
Land
 
-
 
 
$
143,527

 
$
138,224

Land and leasehold improvements
5
-
40
 
203,085

 
187,930

Buildings
15
-
40
 
151,702

 
144,773

Pipelines, storage and terminals
20
-
40
 
5,080,795

 
4,647,718

Rights-of-way
20
-
40
 
264,170

 
202,311

Construction in progress
 
-
 
 
400,202

 
114,322

Total
 
 
 
 
6,243,481

 
5,435,278

Less accumulated depreciation and amortization
 
 
 
 
(1,942,548
)
 
(1,712,995
)
Property, plant and equipment, net
 
 
 
 
$
4,300,933

 
$
3,722,283


Capitalized interest costs added to property, plant and equipment totaled $5.5 million, $3.4 million and $5.5 million for the years ended December 31, 2017, 2016 and 2015, respectively. Depreciation and amortization expense for property, plant and equipment totaled $222.5 million, $200.7 million and $192.3 million for the years ended December 31, 2017, 2016 and 2015, respectively.