Other intangible assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of finite-lived intangible assets

Other intangible assets consist of the following as of December 31, 2016 and 2015:

	Favorable lease assets		Internet sites		Trade names	Total
	$'000		$'000		$'000	$'000
Carrying amount:
Balance at January 1, 2015	8,586		1,888		7,100	17,574
Additions	714		—		—	714
Foreign currency translation adjustment	(807	)	(97	)	—	(904	)
Balance at December 31, 2015	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
Accumulated amortization:
Balance at January 1, 2015	2,486		1,130			3,616
Charge for the year	341		190			531
Foreign currency translation adjustment	(554	)	(60	)		(614	)
Balance at December 31, 2015	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
Net book value:
December 31, 2014	6,100		758		7,100	13,958
December 31, 2015	6,220		531		7,100	13,851
December 31, 2016	5,865		433		7,579	13,877