Other intangible assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of finite-lived intangible assets

Other intangible assets consist of the following as of December 31, 2017 and 2016:

	Favorable lease assets		Internet sites		Trade names	Total
	$'000		$'000		$'000	$'000
Carrying amount:
Balance at January 1, 2016	8,493		1,791		7,100	17,384
Additions	—		177		—	177
Foreign currency translation adjustment	8		(310	)	479	177
Balance at December 31, 2016	8,501		1,658		7,579	17,738
Additions	—		—		6,100	6,100
Disposals	—		(247	)	—	(247	)
Foreign currency translation adjustment	59		168		322	549
Balance at December 31, 2017	8,560		1,579		14,001	24,140
Accumulated amortization:
Balance at January 1, 2016	2,273		1,260			3,533
Charge for the year	373		188			561
Foreign currency translation adjustment	(10	)	(223	)		(233	)
Balance at December 31, 2016	2,636		1,225			3,861
Charge for the year	434		166			600
Disposals	—		(247	)		(247	)
Foreign currency translation adjustment	22		126			148
Balance at December 31, 2017	3,092		1,270			4,362
Net book value:
December 31, 2015	6,220		531		7,100	13,851
December 31, 2016	5,865		433		7,579	13,877
December 31, 2017	5,468		309		14,001	19,778