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Trade Receivables
3 Months Ended
Mar. 31, 2018
Receivables [Abstract]  
Trade Receivables
Trade Receivables
The following table shows the breakdown in trade receivables net book value for the presented periods:
 
December 31, 2017

 
March 31, 2018

 
 
 
 
 
(in thousands)
Trade accounts receivables
$
504,919

 
$
419,667

(Less) Allowance for doubtful accounts
(20,818
)
 
(23,960
)
Net book value at end of period
$
484,101

 
$
395,707

Changes in allowance for doubtful accounts are summarized below:
 
2017

 
2018

 
 
 
 
 
(in thousands)
Balance at January 1
$
(11,598
)
 
$
(20,818
)
Allowance for doubtful accounts
(3,686
)
 
(4,436
)
Reversal of provision
2,142

 
1,460

Currency translation adjustment
(87
)
 
(166
)
Balance at March 31
$
(13,229
)
 
$
(23,960
)

The change in allowance for doubtful accounts during the first three months of 2018 related mainly to increased business with categories of clients associated with a higher credit risk.