Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2017

Schedule II — Valuation and Qualifying Accounts

			Additions
			Charged
	Balance at		(Credited)			Charged to						Balance at
	Beginning		to Costs and			Other						End of
Deducted from asset accounts:	of Period		Expenses			Accounts			Deductions			Period
	(in thousands)
Year ended December 31, 2017
Allowance for doubtful accounts	$	286	$	99		$	—		$	(115	)	$	270
Valuation allowance in net deferred tax assets	106,793		(51,410		)	45,301			—			100,684

	$	107,079	$	(51,311	)	$	45,301		$	(115	)	$	100,954


Year ended December 31, 2016
Allowance for doubtful accounts	$	206	$	171		$	—		$	(91	)	$	286
Valuation allowance in net deferred tax assets	56,273		50,520			—			—			106,793

	$	56,479	$	50,691		$	—		$	(91	)	$	107,079


Year ended December 31, 2015
Allowance for doubtful accounts	$	731	$	43		$	—		$	(568	)	$	206
Valuation allowance in net deferred tax assets	34,909		23,655			(2,291		)	—			56,273

	$	35,640	$	23,698		$	(2,291	)	$	(568	)	$	56,479