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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2015
Receivables [Abstract]  
Accounts Receivable
 
December 31,
 
2015
 
2014
 
(in thousands)
Accounts receivable
$
50,139

 
$
44,263

Less:  Allowance for doubtful accounts
(115
)
 
(171
)
Total, net
$
50,024

 
$
44,092
Accounts Receivable (Allowance)
 
Years Ending December 31,
 
2015
 
2014
 
2013
Allowance for doubtful accounts:
(in thousands)
Balance, beginning of period
$
171

 
$
193

 
$
52

Provisions for losses on accounts receivables, net of adjustments
(48
)
 
—

 
141

Accounts receivable written off, net of recoveries
(8
)
 
(22
)
 
—

Balance, end of period
$
115

 
$
171

 
$
193