Commitments and contingencies (Tables)

6 Months Ended

Jun. 30, 2015

Commitments and Contingencies Disclosure [Abstract]

Schedule of future rental payments under operating leases

Future rental payments as at June 30, 2015 under operating leases in respect of equipment rentals and leased premises are payable as follows:

	$’000
Remainder of 2015	5,285
2016	10,018
2017	9,947
2018	9,518
2019	9,111
2020	9,221
2021 and thereafter	70,030
Future rental payments under operating leases	123,130