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Risk management and concentrations of risk - Interest rate swap agreements (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
2.941 % Interest Rate [Member]  
Derivative [Line Items]  
Derivative, Interest rate index LIBOR
Derivative, Notional Amount $ 61,478
Derivative Liability, Fair Value carrying amount assets $ (3,241)
Derivative, Term Jan 2026
Derivative, Fixed interest rate 2.941%
2.838 % Interest Rate [Member]  
Derivative [Line Items]  
Derivative, Interest rate index LIBOR
Derivative, Notional Amount $ 61,478
Derivative Liability, Fair Value carrying amount assets $ (2,909)
Derivative, Term Oct 2025
Derivative, Fixed interest rate 2.838%
2.735 % Interest Rate [Member]  
Derivative [Line Items]  
Derivative, Interest rate index LIBOR
Derivative, Notional Amount $ 61,478
Derivative Liability, Fair Value carrying amount assets $ (2,699)
Derivative, Term Jan 2026
Derivative, Fixed interest rate 2.735%
2.650 % Interest Rate [Member]  
Derivative [Line Items]  
Derivative, Interest rate index LIBOR
Derivative, Notional Amount $ 61,478
Derivative Liability, Fair Value carrying amount assets $ (2,476)
Derivative, Term Jan 2026
Derivative, Fixed interest rate 2.65%
Lampung [Member]  
Derivative [Line Items]  
Derivative, Interest rate index LIBOR
Derivative, Notional Amount $ 117,022
Derivative Liability, Fair Value carrying amount assets $ (3,610)
Derivative, Term Sep 2026
Derivative, Fixed interest rate 2.80%