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PROPERTY, PLANT AND EQUIPMENT
 12 Months Ended
Dec. 31, 2017
Property Plant And Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT

NOTE 9—PROPERTY, PLANT AND EQUIPMENT

A summary of property, plant and equipment by asset category is as follows:

 

 

 

December 31,

 

 

 

2017

 

 

2016

 

 

 

(In thousands)

 

Marine Vessels

 

$

1,799,177

 

 

$

1,789,942

 

Construction Equipment

 

 

498,621

 

 

 

474,128

 

Buildings

 

 

157,340

 

 

 

152,584

 

All other

 

 

161,855

 

 

 

148,805

 

Construction in Progress

 

 

34,094

 

 

 

20,720

 

Total Cost

 

 

2,651,087

 

 

 

2,586,179

 

Accumulated Depreciation

 

 

(985,273

)

 

 

(898,878

)

Net Book Value

 

$

1,665,814

 

 

$

1,687,301

 

Interest capitalization―We incurred interest of $67 million, $75 million and $74 million and capitalized $2 million, $14 million and $23 million of interest in 2017, 2016 and 2015, respectively.  The capitalized interest primarily related to vessels under construction in the respective periods – the DLV 2000 and LV 108.

Depreciation―Our depreciation expense was approximately $93 million, $90 million and $100 million in 2017, 2016 and 2015, respectively.