Commitments and contingencies (Tables)

12 Months Ended

Dec. 31, 2013

Commitments and Contingencies Disclosure [Abstract]

Schedule of future rental payments under operating leases

Future rental payments under operating leases in respect of equipment rentals and leased premises are payable as follows:

Year ended December 31,	$’000
2014	11,356
2015	11,246
2016	11,146
2017	11,201
2018	10,454
2019 and thereafter	87,191
	142,594