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OTHER NONOPERATING EXPENSE, NET
 6 Months Ended
Jun. 30, 2018
Other Income and Expenses [Abstract]  
OTHER NON-OPERATING INCOME / EXPENSE
16.    OTHER NON-OPERATING INCOME / EXPENSE, NET
Other non-operating income / expense, net comprised the following for the three and six months ended June 30, 2018 and 2017:
 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
 
2018

 
2017

 
2018

 
2017

Interest income
$
204

 
$
110

 
$
346

 
$
187

Foreign currency exchange (loss) / gain, net
(6,054
)
 
7,864

 
(1,788
)
 
9,476

Change in fair value of derivatives (Note 12)
(1,101
)
 
(1,100
)
 
(1,329
)
 
(732
)
Loss on extinguishment of debt
(179
)
 
—

 
(288
)
 
—

Other income, net
194

 
34

 
171

 
209

Total other non-operating (expense) / income, net
$
(6,936
)
 
$
6,908

 
$
(2,888
)
 
$
9,140