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Accounts Receivable
 9 Months Ended
Sep. 30, 2014
Receivables [Abstract]  
Accounts Receivable
Accounts Receivable

Accounts receivable and the related allowance for doubtful accounts are as follows:
 
 
September 30,
2014
 
December 31, 2013
 
(in thousands)
Accounts receivable
$
54,919

 
$
39,256

Less:  Allowance for doubtful accounts
(134
)
 
(193
)
Total, net
$
54,785

 
$
39,063


 
 
Three months ended
 
Nine months ended
 
September 30,
2014
 
September 30,
2013
 
September 30,
2014
 
September 30,
2013
Allowance for doubtful accounts:
(in thousands)
 
 
 
 
Balance, beginning of period
$
185

 
$
154

 
$
193

 
$
52

Provisions for losses on accounts receivables
(51
)
 
19

 
(66
)
 
121

Accounts receivable written off, net of recoveries
—

 
—

 
7

 
—

Balance, end of period
$
134

 
$
173

 
$
134

 
$
173