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Other Income (Expenses) (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months ended
June 30,
 
2019
 
2018
 
2019
 
2018
 
(unaudited)
 
(unaudited)
Interest income
$
5,453

 
$
3,664

 
$
10,134

 
$
4,870

Interest expense
(4,169
)
 
(4,324
)
 
(8,879
)
 
(5,041
)
Interest expense-nonrecourse liability related to sale of future royalties
(1,136
)
 
(1,204
)
 
(2,296
)
 
(1,905
)
 
 
 
 
 
 
 
 
Total
$
148

 
$
(1,864
)
 
$
(1,041
)
 
$
(2,076
)