Administrative expenses (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Administrative expenses [Abstract]

Disclosure of detailed information about administrative expenses [text block]

Amounts in US$ '000	2017		2016		2015
Staff costs (Note 11)		24,713		19,451		18,215
Share-based payment (Notes 11)		3,117		1,847		6,881
Consultant fees		5,120		3,894		4,115
Office expenses		2,506		2,217		2,535
Travel expenses		2,772		1,717		1,497
Director’s fees and allowance (Note 11)		3,458		2,088		1,238
Communication and IT costs		2,109		2,013		1,791
Allocation to joint operations		(7,646)		(4,365)		(4,203)
Other administrative expenses		5,905		5,308		5,402
		42,054		34,170		37,471