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Lines of credit and loan facilities (Details 2) - Term and Revolving Credit Facilities
$ in Thousands
1 Months Ended
Dec. 31, 2017
USD ($)
item
Lines of credit and loan facilities  
Stated maturity term of debt securities 5 years
Maximum borrowing capacity under facility $ 1,000,000
Number of arrangers | item 24
Undrawn balance $ 1,000,000
Undrawn balance which will be expired at the date falling 6 months after this credit facilities agreement 450,000
Undrawn balance which will be expired one month prior to the final maturity date $ 550,000
LIBOR  
Lines of credit and loan facilities  
Percentage over variable rate basis 1.15%
Description of variable rate basis LIBOR