Intangibles and goodwill (Tables)

12 Months Ended

Dec. 31, 2019

Intangibles and goodwill

Schedule of indefinite-lived intangible assets

			Option
	Above		for time
	market time		charter	Total
(in thousands of U.S. dollars)	charter		extension	Intangibles	Goodwill	Total
Historical cost December 31, 2017	$	22,760	8,000	30,760	251	$	31,011
Amortization for the year		(3,631)	—	(3,631)	—		(3,631)
Accumulated amortization, December 31, 2018		(10,272)	—	(10,272)	—		(10,272)
Intangibles and goodwill, December 31, 2018		12,488	8,000	20,488	251		20,739
Historical cost December 31, 2018		22,760	8,000	30,760	251		31,011
Additions		—	—	—	—		—
Historical cost December 31, 2019		22,760	8,000	30,760	251		31,011
Amortization for the year		(3,631)	—	(3,631)	—		(3,631)
Accumulated amortization, December 31, 2019		(13,903)	—	(13,903)	—		(13,903)
Intangibles and goodwill, December 31, 2019	$	8,857	8,000	16,857	251	$	17,108

Schedule of estimated future amortization expense

The following table presents estimated future amortization expense for the intangibles:

(in thousands of U.S. dollars)	Total
2020	$	3,053
2021		2,755
2022		2,755
2023		2,755
2024		2,762
2025 and thereafter	$	2,777