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Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
VAT receivable $ 6,531 $ 7,854
Prepaid income tax asset 4,813 5,090
Prepaid and other current assets 3,304 2,664
Total other current assets $ 14,648 $ 15,608