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Trade Receivables
3 Months Ended
Mar. 31, 2016
Receivables [Abstract]  
Trade Receivables
Trade Receivables
The following table shows the breakdown in trade receivables net book value for the presented periods:
 
 
 
 
 
December 31, 2015
 
March 31, 2016
 
(in thousands)
Trade accounts receivables
$
267,845

 
$
269,475

(Less) Allowance for doubtful accounts
(6,264
)
 
(6,951
)
Net book value at end of period
$
261,581

 
$
262,524

Changes in allowance for doubtful accounts are summarized below:
 
2015
 
2016
 
(in thousands)
Balance at January 1
$
(3,930
)
 
$
(6,264
)
Allowance for doubtful accounts
(783
)
 
(906
)
Reversal of provision
157

 
366

Change in consolidation scope
(135
)
 

Currency translation adjustment
375

 
(147
)
Balance at March 31
$
(4,316
)
 
$
(6,951
)