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Financial Instruments - Liquidity risk (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Non derivative financial Liabilities [Abstract]      
Financial liability at amortized cost     $ 5,071
Lease liabilities $ 4,220 $ 5,899 0
Guarantee deposits 400   154
Unsecured Borrowings      
Non derivative financial Liabilities [Abstract]      
Short-term borrowings 57,339   20,000
Secured Borrowings      
Non derivative financial Liabilities [Abstract]      
Short-term borrowings 164,000   164,000
Not later than Six months [Member]      
Non derivative financial Liabilities [Abstract]      
Financial liability at amortized cost     5,071
Lease liabilities 971    
Guarantee deposits 400   154
Non-derivative financial liabilities, undiscounted cash flows 173,244   139,557
Not later than Six months [Member] | Unsecured Borrowings      
Non derivative financial Liabilities [Abstract]      
Short-term borrowings 57,625   20,003
Not later than Six months [Member] | Secured Borrowings      
Non derivative financial Liabilities [Abstract]      
Short-term borrowings 114,248   114,329
Later than six months and not later than one year [member]      
Non derivative financial Liabilities [Abstract]      
Financial liability at amortized cost     0
Lease liabilities 559    
Guarantee deposits 0   0
Non-derivative financial liabilities, undiscounted cash flows 50,565   50,005
Later than six months and not later than one year [member] | Unsecured Borrowings      
Non derivative financial Liabilities [Abstract]      
Short-term borrowings 0   0
Later than six months and not later than one year [member] | Secured Borrowings      
Non derivative financial Liabilities [Abstract]      
Short-term borrowings 50,006   50,005
Later than one year and not later than two years [member]      
Non derivative financial Liabilities [Abstract]      
Financial liability at amortized cost     0
Lease liabilities 1,614    
Guarantee deposits 0   0
Non-derivative financial liabilities, undiscounted cash flows 1,614   0
Later than one year and not later than two years [member] | Unsecured Borrowings      
Non derivative financial Liabilities [Abstract]      
Short-term borrowings 0   0
Later than one year and not later than two years [member] | Secured Borrowings      
Non derivative financial Liabilities [Abstract]      
Short-term borrowings 0   0
Later than two years and not later than five years [member]      
Non derivative financial Liabilities [Abstract]      
Financial liability at amortized cost     0
Lease liabilities 1,306    
Guarantee deposits 0   0
Non-derivative financial liabilities, undiscounted cash flows 1,306   0
Later than two years and not later than five years [member] | Unsecured Borrowings      
Non derivative financial Liabilities [Abstract]      
Short-term borrowings 0   0
Later than two years and not later than five years [member] | Secured Borrowings      
Non derivative financial Liabilities [Abstract]      
Short-term borrowings 0   0
Later than five years [member]      
Non derivative financial Liabilities [Abstract]      
Financial liability at amortized cost     0
Lease liabilities 0    
Guarantee deposits 0   0
Non-derivative financial liabilities, undiscounted cash flows 0   0
Later than five years [member] | Unsecured Borrowings      
Non derivative financial Liabilities [Abstract]      
Short-term borrowings 0   0
Later than five years [member] | Secured Borrowings      
Non derivative financial Liabilities [Abstract]      
Short-term borrowings 0   0
Contractual Cash Flows [Member]      
Non derivative financial Liabilities [Abstract]      
Financial liability at amortized cost     5,071
Lease liabilities 4,450    
Guarantee deposits 400   154
Non-derivative financial liabilities, undiscounted cash flows 226,729   189,562
Contractual Cash Flows [Member] | Unsecured Borrowings      
Non derivative financial Liabilities [Abstract]      
Short-term borrowings 57,625   20,003
Contractual Cash Flows [Member] | Secured Borrowings      
Non derivative financial Liabilities [Abstract]      
Short-term borrowings $ 164,254   $ 164,334