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Other Current Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Other Liabilities Disclosure [Abstract]    
Clients' prepayments $ 11,396 $ 10,328
Credit notes 16,031 13,183
Accounts payable relating to capital expenditures 9,545 21,454
Other creditors 1,592 1,527
Deferred revenue 304 623
Total $ 38,868 $ 47,115