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VESSELS AND EQUIPMENT, NET (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Cost |  |
As of January 1 | $ 3,624,224 | $ 3,638,048
Additions | 7,156 | 35,984
Transfer from asset under development | (127,620) |
Write-offs | (13,018) | (49,808)
As of December 31 | 3,490,742 | 3,624,224
Depreciation, amortization and impairment |  |
As of January 1 | (463,675) | (366,669)
Charge for the year | (107,460) | (112,564)
Transfer to asset under development | 50,448 |
Impairment |  | (34,250)
Write-offs | 13,018 | 49,808
As of December 31 | (507,669) | (463,675)
Net book value | 2,983,073 | 3,160,549
License |  |
Depreciation, amortization and impairment |  |
Amortization charge | 500 | 500
Vessels and equipment |  |
Cost |  |
As of January 1 | 3,429,317 | 3,447,464
Additions | 3,282 | 6,268
Transfer from asset under development | (127,620) |
Write-offs | (6,125) | (24,415)
As of December 31 | 3,298,854 | 3,429,317
Depreciation, amortization and impairment |  |
As of January 1 | (434,396) | (331,477)
Charge for the year | (87,383) | (93,084)
Transfer to asset under development | 50,448 |
Impairment |  | (34,250)
Write-offs | 6,125 | 24,415
As of December 31 | (465,206) | (434,396)
Net book value | 2,833,648 | 2,994,921
Mooring equipment - FLNG |  |
Cost |  |
As of January 1 | 45,771 | 45,771
Additions | 0 | 0
Transfer from asset under development | 0 |
Write-offs | 0 | 0
As of December 31 | 45,771 | 45,771
Depreciation, amortization and impairment |  |
As of January 1 | (9,106) | (3,392)
Charge for the year | (5,714) | (5,714)
Transfer to asset under development | 0 |
Impairment |  | 0
Write-offs | 0 | 0
As of December 31 | (14,820) | (9,106)
Net book value | 30,951 | 36,665
Drydocking expenditure |  |
Cost |  |
As of January 1 | 140,738 | 133,316
Additions | 3,713 | 29,557
Transfer from asset under development | 0 |
Write-offs | (6,500) | (22,135)
As of December 31 | 137,951 | 140,738
Depreciation, amortization and impairment |  |
As of January 1 | (16,434) | (26,039)
Charge for the year | (13,080) | (12,530)
Transfer to asset under development | 0 |
Impairment |  | 0
Write-offs | 6,500 | 22,135
As of December 31 | (23,014) | (16,434)
Net book value | 114,937 | 124,304
Office equipment |  |
Cost |  |
As of January 1 | 8,398 | 11,497
Additions | 161 | 159
Transfer from asset under development | 0 |
Write-offs | (393) | (3,258)
As of December 31 | 8,166 | 8,398
Depreciation, amortization and impairment |  |
As of January 1 | (3,739) | (5,761)
Charge for the year | (1,283) | (1,236)
Transfer to asset under development |  |
Impairment |  | 0
Write-offs | 393 | 3,258
As of December 31 | (4,629) | (3,739)
Net book value | $ 3,537 | $ 4,659

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