Accounts Receivable (Tables)

6 Months Ended

Jun. 30, 2016

Receivables [Abstract]

Accounts Receivable

	June 30, 2016			December 31, 2015
	(in thousands)
Accounts receivable	$	58,556		$	50,139
Less:  Allowance for doubtful accounts	(73		)	(115		)
Total, net	$	58,483		$	50,024

Allowance for Doubtful Accounts

	Three months ended						Six months ended
	June 30, 2016			June 30, 2015			June 30, 2016			June 30, 2015
Allowance for doubtful accounts:	(in thousands)
Balance, beginning of period	$	238		$	112		$	115		$	171
Provisions for losses on accounts receivables, net of recoveries	(165		)	(43		)	(42		)	(94		)
Accounts receivable written off	—			—			—			(8		)
Balance, end of period	$	73		$	69		$	73		$	69