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Other Current Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Other Liabilities Disclosure [Abstract]    
Clients' prepayments $ 20,742 $ 33,495
Accounts payable relating to capital expenditures 36,340 30,736
Other creditors 1,567 740
Deferred revenue 814 706
Total $ 59,463 $ 65,677