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Commitments and contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Rental commitments [Member]  
Future Minimum Payments under Non-Cancellable Leases
(In thousands)
 
 
 
 
2018
 
 
3,440
 
2019
 
 
1,784
 
2020
 
 
232
 
 
 
 
5,456
 
Bandwidth Lease Commitments [Member]  
Future Minimum Payments under Non-Cancellable Leases
(In thousands)
 
 
 
 
2018
 
 
11,536
 
2019
 
 
418
 
2020
 
 
84
 
 
 
 
12,038
 
Capital commitments [Member]  
Future Minimum Payments under Non-Cancellable Leases
 
(In thousands)
 
 
 
 
2018
 
 
2,953
 
2019
 
 
971
 
2020
 
 
444
 
 
 
 
4,368