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Other Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Other Liabilities Disclosure [Abstract]    
Clients' prepayments $ 10,328 $ 23,857
Credit notes 13,183 9,638
Accounts payable relating to capital expenditures 21,454 30,736
Other creditors 1,527 740
Deferred revenue 623 706
Total $ 47,115 $ 65,677