SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Dec. 31, 2019

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS

	For the years ended
	December 31, 2019, 2018 and 2017
	Balance at		Charged to						Balance
	Beginning		Costs and			Net (Deductions)			at End of
(in thousands)	of Period		Expenses			Recoveries			Period
Year ended December 31, 2019
Allowance for doubtful accounts	$	4,813	$	1,481		$	(1,113)	(1)	$	5,181
Deferred tax asset valuation allowance	$	445	$	—		$	26		$	471
Reserve for obsolete or slow moving inventory	$	10,169	$	6,467		$	(6,169)	(3)	$	10,467
Year ended December 31, 2018
Allowance for doubtful accounts	$	4,471	$	588		$	(246)	(1)	$	4,813
Deferred tax asset valuation allowance	$	3,994	$	—		$	(3,549)		$	445
Reserve for obsolete or slow moving inventory	$	3,875	$	8,088		$	(1,794)	(3)	$	10,169
Year ended December 31, 2017
Allowance for doubtful accounts	$	2,553	$	1,441		$	477	(1)	$	4,471
Deferred tax asset valuation allowance	$	356	$	3,638	(2)	$	—		$	3,994
Reserve for obsolete or slow moving inventory	$	3,052	$	5,869		$	(5,046)	(3)	$	3,875

(1) Net (deductions) recoveries in the allowance for doubtful accounts principally reflect the write-off of previously reserved accounts net of recoveries.

(2) The valuation allowance for deferred tax assets is increased or decreased each year to reflect the net operating losses, foreign tax credits and capital losses that management believes will not be utilized before they expire.

(3) Net (deductions) recoveries in the reserve for obsolete or slow moving inventory principally reflect the write-off and/ or disposal of previously reserved inventory.