Quarterly report pursuant to Section 13 or 15(d)

Other Income (Expense), Net ( Details Textuals)

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Other Income (Expense), Net ( Details Textuals) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Other Income Expenses [Line Items]        
Other Operating Income (Expense), Net $ (5,609) $ (10,753) $ (8,424) $ (7,948)
Foreign currency gain (loss)        
Other Income Expenses [Line Items]        
Other Operating Income (Expense), Net 8,100 14,500 10,800 11,800
Gain from an insurance claim        
Other Income Expenses [Line Items]        
Other Operating Income (Expense), Net $ 2,500 $ 3,700 $ 2,400 $ 3,900