Accounts Receivable (Tables)

9 Months Ended

Sep. 30, 2013

Receivables [Abstract]

Accounts Receivable

	September 30, 2013			December 31, 2012
	(in thousands)
Accounts receivable	$	46,302		$	43,918
Less:  Allowance for doubtful accounts	(173		)	(52		)
Total, net	$	46,129		$	43,866

Accounts Receivable (Allowance)

	Three months ended					Nine months ended
	September 30, 2013		September 30, 2012			September 30, 2013		September 30, 2012
Allowance for doubtful accounts:	(in thousands)
Balance, beginning of period	$	154	$	242		$	52	$	268
Provisions for losses on accounts receivables	19		(7		)	121		(8		)
Accounts receivable written off, net of recoveries	—		(3		)	—		(28		)
Balance, end of period	$	173	$	232		$	173	$	232