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VESSELS AND EQUIPMENT, NET (Tables)
 12 Months Ended
Dec. 31, 2018
Property and equipment:  
Components of vessels and equipment, net
Useful lives applied in depreciation are as follows:

Vessels (excluding converted FSRUs and FLNG)
40 years
Vessels - converted FSRUs

20 years from conversion date

Vessels - FLNG
30 years from conversion date

Drydocking expenditure
5 years
Deferred drydocking expenditure - FLNG
20 years
Mooring equipment - FLNG
8 years
Office equipment and fittings
3 to 6 years
Vessels and equipment  
Property and equipment:  
Components of vessels and equipment, net
(in thousands of $)
2018

2017

Cost
 
 
As of January 1
2,431,136

2,438,720

Additions
11,304

1,349

Transfer from asset under development (1)

1,296,431

—

Transfer to asset under development
(90,828
)
—

Write-offs
(9,995
)
(8,933
)
As of December 31
3,638,048

2,431,136

 
 
 
Depreciation, amortization and impairment
 
 
As of January 1
(354,077
)
(284,889
)
Charge for the year (2)
(93,415
)
(76,522
)
Transfer to asset under development
70,828

—

Write-offs
9,995

7,334

As of December 31

(366,669
)
(354,077
)
 
 
—

Net book value as at December 31
3,271,379

2,077,059


(1) On completion of the Hilli FLNG conversion and commissioning, we reclassified the total balance from "Asset under development" in our consolidated balance sheet as of December 31, 2018. Capitalized interest costs of $148.1 million are included in the cost amounts above as of December 31, 2018.
(2) Depreciation and amortization charge for the year ended December 31, 2018 excludes $0.3 million of amortization charged to non-current assets in relation to the Cameroon License fee.