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Trade Receivables (Tables)
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Allowance for doubtful accounts Trade receivables, net, consisted of the following (in thousands):
 
As of December 31,
 
2018
 
2017
Trade receivables
$
45,946

 
$
42,804

Allowance for doubtful accounts
(99
)
 
(119
)
 
$
45,847

 
$
42,685
Schedule Of Changes In Allowance For Doubtful Accounts Changes in our allowance for doubtful trade receivables were as follows (in thousands):
 
2018
 
2017
 
2016
Balance, January 1
$
119

 
$
170

 
$
918

Charges to bad debt expense
27

 
311

 
289

Write-offs, net
(47
)
 
(362
)
 
(1,037
)
Balance, December 31
$
99

 
$
119

 
$
170