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Other Income (Expense), Net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Income (Expense), Net [Abstract]      
Other income (expense), net $ (8,916) $ (18,265) $ (32,743)
Foreign currency transaction losses on net monetary assets denominated in bolivar     10,200
Foreign currency translation expenses     17,000
Interest expense $ 22,200 $ 15,600 $ 7,900