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Accounts Receivable
 6 Months Ended
Jun. 30, 2018
Receivables [Abstract]  
Accounts Receivable
Accounts Receivable

Accounts receivable and the related allowance for doubtful accounts are as follows:
 
 
June 30,
2018
 
December 31, 2017
 
(in thousands)
Accounts receivable
$
53,626

 
$
50,457

Less:  Allowance for doubtful accounts
(208
)
 
(119
)
Total, net
$
53,418

 
$
50,338


 
 
Three months ended
 
Six months ended
 
June 30,
2018
 
June 30,
2017
 
June 30,
2018
 
June 30,
2017
Allowance for doubtful accounts:
(in thousands)
Balance, beginning of period
$
108

 
$
274

 
$
119

 
$
90

Provisions for losses on accounts receivables, net of recoveries
109

 
(43
)
 
98

 
141

Accounts receivable written off
(9
)
 
(150
)
 
(9
)
 
(150
)
Balance, end of period
$
208

 
$
81

 
$
208

 
$
81