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Lines of credit and loan facilities (Details 2) - Term and Revolving Credit Facilities
$ in Thousands
1 Months Ended 9 Months Ended
Dec. 31, 2017
USD ($)
item
Sep. 30, 2019
USD ($)
Lines of credit and loan facilities    
Term (in years) 5 years  
Maximum borrowing capacity under facilities $ 1,000,000  
Number of arrangers | item 24  
Undrawn balance which will be expired one month prior to the final maturity date   $ 550,000
Commitment fee (as a percentage)   0.20%
LIBOR    
Lines of credit and loan facilities    
Percentage over variable rate basis 1.15%