Annual report pursuant to Section 13 and 15(d)

Other Income (Expense), Net (Detail Textuals)

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Other Income (Expense), Net (Detail Textuals) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Income and Expenses [Abstract]      
Other income (expense), net $ 20,653 $ (10,401) $ (8,302)
Unrealized and realized losses on fuel swap derivative hedge contracts     16,100
Gains on foreign currency exchange     4,500
Gains on foreign currency exchange derivative hedge contracts     $ 3,900