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Other Current Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Other Liabilities Disclosure [Abstract]    
Clients' prepayments $ 10,700 $ 13,618
Credit notes 11,913 16,420
Accounts payable relating to capital expenditures 14,576 4,408
Other creditors 1,718 1,213
Deferred revenue 75 227
Total $ 38,982 $ 35,886