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


$
408,842

(Less) Allowance for doubtful accounts
(6,264
)

(11,598
)
Net book value at end of period
$
261,581

 
$
397,244

Changes in allowance for doubtful accounts are summarized below:
 
Year Ended December 31,
 
2014
 
2015
 
2016
 
 
 
(in thousands)
Balance at beginning of period
$
(2,529
)

$
(3,930
)

$
(6,264
)
Provision for doubtful accounts
(2,248
)

(2,660
)

(9,898
)
Reversal of provision
910


—


4,464

Change in consolidation scope
(450
)

(99
)

(221
)
Currency translation adjustment
387


425


321

Balance at end of period
$
(3,930
)
 
$
(6,264
)
 
$
(11,598
)