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OTHER NON-OPERATING EXPENSE (Notes)
 12 Months Ended
Dec. 31, 2019
Other Income and Expenses [Abstract]  
Other Income and Other Expense Disclosure [Text Block]
16.    OTHER NON-OPERATING INCOME / EXPENSE, NET
Other non-operating income / expense, net comprised the following for the years ended December 31, 2019, 2018 and 2017:
 
For The Year Ended December 31,
 
2019

 
2018

 
2017

Interest income
$
467

 
$
725

 
$
536

Foreign currency exchange (loss) / gain, net
(2,376
)
 
(2,691
)
 
17,761

Change in fair value of derivatives (Note 12)
(201
)
 
(1,715
)
 
(1,783
)
Loss on extinguishment of debt
(340
)
 
(415
)
 
(101
)
Other income, net
242

 
508

 
428

Total other non-operating (expense) / income, net
$
(2,208
)

$
(3,588
)

$
16,841