Supplemental cash flow information (Tables)

12 Months Ended

Dec. 31, 2018

Supplemental Cash Flow Elements [Abstract]

Schedule of supplemental cash flow information

	2018	2017	2016
Year ended December 31,	$’000	$’000	$’000
Cash paid during the period for:
Interest	34,606	30,329	40,930
Income taxes, net of refunds	16,681	19,838	19,804