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Trade Receivables (Tables)
6 Months Ended
Jun. 30, 2017
Receivables [Abstract]  
Schedules of trade receivables net book value and Changes in allowance for doubtful accounts
The following table shows the breakdown in trade receivables net book value for the presented periods:
 
December 31, 2016

 
June 30, 2017

 
 
 
 
 
(in thousands)
Trade accounts receivables
$
408,842

 
$
384,770

(Less) Allowance for doubtful accounts
(11,598
)
 
(14,718
)
Net book value at end of period
$
397,244

 
$
370,052

Changes in allowance for doubtful accounts are summarized below:
 
2016

 
2017

 
 
 
 
 
(in thousands)
Balance at January 1
$
(6,264
)
 
$
(11,598
)
Allowance for doubtful accounts
(4,652
)
 
(5,347
)
Reversal of provision
806

 
2,630

Currency translation adjustment
(28
)
 
(403
)
Balance at June 30
$
(10,138
)
 
$
(14,718
)