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Other Income (Expenses) (Tables)
 9 Months Ended
Sep. 30, 2019
Other Income and Expenses [Abstract]  
Schedule of other income (expenses)
Other income (expenses) consist of the following, in thousands of dollars:
 
Three Months ended September 30,
 
Nine Months ended
September 30,
 
2019
 
2018
 
2019
 
2018
 
(unaudited)
 
(unaudited)
Interest income
$
5,523

 
$
4,461

 
$
15,657

 
$
9,331

Interest expense
(4,546
)
 
(4,374
)
 
(13,425
)
 
(9,415
)
Interest expense on nonrecourse liability related to sale of future royalties
(1,116
)
 
(1,191
)
 
(3,412
)
 
(3,096
)
 
 
 
 
 
 
 
 
Total
$
(139
)
 
$
(1,104
)
 
$
(1,180
)
 
$
(3,180
)