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Financial Instruments (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Non derivative financial Liabilities [Abstract]      
Short-term borrowings $ 184,000 $ 147,000 $ 138,000
Financial liability at amortized cost 5,071 4,837 4,524
Guarantee deposits 154 604 1,203
Not later than Six months [Member]      
Non derivative financial Liabilities [Abstract]      
Short-term borrowings 134,332 97,302 88,208
Financial liability at amortized cost 5,071 0 0
Guarantee deposits 154 604 1,203
Non-derivative financial liabilities, undiscounted cash flows 139,557 97,906 89,411
Later than six months and not later than one year [member]      
Non derivative financial Liabilities [Abstract]      
Short-term borrowings 50,005 50,004 50,002
Financial liability at amortized cost 0 0 0
Guarantee deposits 0 0 0
Non-derivative financial liabilities, undiscounted cash flows 50,005 50,004 50,002
Later than one year and not later than two years [member]      
Non derivative financial Liabilities [Abstract]      
Short-term borrowings 0 0 0
Financial liability at amortized cost 0 4,837 0
Guarantee deposits 0 0 0
Non-derivative financial liabilities, undiscounted cash flows 0 4,837 0
Later than two years and not later than five years [member]      
Non derivative financial Liabilities [Abstract]      
Short-term borrowings 0 0 0
Financial liability at amortized cost 0 0 4,524
Guarantee deposits 0 0 0
Non-derivative financial liabilities, undiscounted cash flows 0 0 4,524
Later than five years [member]      
Non derivative financial Liabilities [Abstract]      
Short-term borrowings 0 0 0
Financial liability at amortized cost 0 0 0
Guarantee deposits 0 0 0
Non-derivative financial liabilities, undiscounted cash flows 0 0 0
Contractual Cash Flows [Member]      
Non derivative financial Liabilities [Abstract]      
Short-term borrowings 184,337 147,306 138,210
Financial liability at amortized cost 5,071 4,837 4,524
Guarantee deposits 154 604 1,203
Non-derivative financial liabilities, undiscounted cash flows $ 189,562 $ 152,747 $ 143,937