Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2014

Receivables [Abstract]

Accounts Receivable

	December 31,
	2014			2013
	(in thousands)
Accounts receivable	$	44,263		$	39,256
Less:  Allowance for doubtful accounts	(171		)	(193		)
Total, net	$	44,092		$	39,063

Accounts Receivable (Allowance)

	Years Ending December 31,
	2014			2013		2012
Allowance for doubtful accounts:	(in thousands)
Balance, beginning of period	$	193		$	52	$	268
Provisions for losses on accounts receivables, net of adjustments	—			141		(83		)
Accounts receivable written off, net of recoveries	(22		)	—		(133		)
Balance, end of period	$	171		$	193	$	52