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VESSELS AND EQUIPMENT, NET
12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
VESSELS AND EQUIPMENT, NET
17.
VESSELS AND EQUIPMENT, NET

(in thousands of $)
2017

2016

Cost
2,431,136

2,438,720

Accumulated depreciation
(354,077
)
(284,889
)
Net book value
2,077,059

2,153,831



Drydocking costs of $37.4 million and $44.7 million are included in the cost amounts above as of December 31, 2017 and 2016, respectively. Accumulated amortization of those costs as of December 31, 2017 and 2016 were $24.3 million and $22.7 million, respectively.

Depreciation and amortization expense for each of the years ended December 31, 2017, 2016 and 2015 was $76.5 million, $73.0 million and $73.7 million, respectively.

As at December 31, 2017 and 2016, vessels with a net book value of $2,032.7 million and $2,106.1 million, respectively, were pledged as security for certain debt facilities (see note 31).

As at December 31, 2017 and 2016, included in the above amounts is office equipment with a net book value of $3.9 million.