Accounts Receivable (Tables)

6 Months Ended

Jun. 30, 2017

Receivables [Abstract]

Accounts Receivable

	June 30, 2017			December 31, 2016
	(in thousands)
Accounts receivable	$	43,195		$	43,091
Less:  Allowance for doubtful accounts	(81		)	(90		)
Total, net	$	43,114		$	43,001

Allowance for Doubtful Accounts

	Three months ended						Six months ended
	June 30, 2017			June 30, 2016			June 30, 2017			June 30, 2016
Allowance for doubtful accounts:	(in thousands)
Balance, beginning of period	$	274		$	238		$	90		$	115
Provisions for losses on accounts receivables, net of recoveries	(43		)	(165		)	141			(42		)
Accounts receivable written off	(150		)	—			(150		)	—
Balance, end of period	$	81		$	73		$	81		$	73