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Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Other Current Assets: [Abstract]    
Creditable taxes (value added taxes) $ 8,809 $ 9,722
Vendor inventory deposits (prepaid) 10,000 3,750
Prepaid income taxes 4,867 4,659
Prepaid Insurance 1,480 2,248
Other 3,120 3,515
Other Assets, Current $ 28,276 $ 23,894