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Other Current Liabilities (Tables)
 3 Months Ended
Mar. 31, 2020
Other Liabilities Disclosure [Abstract]  
Other current liabilities
Other current liabilities are presented in the following table:
December 31, 2019March 31, 2020
(in thousands)
Clients' prepayments$13,618  $11,249  
Credit notes16,420  18,993  
Accounts payable relating to capital expenditures4,408  3,834  
Other creditors1,213  1,447  
Deferred revenue227  186  
Total$35,886  $35,709