Schedule II Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2017

Valuation and Qualifying Accounts [Abstract]

Schedule of Valuation and Qualifying Accounts Disclosure

Schedule II — Valuation and Qualifying Accounts (in thousands)



Column A	Column B		Column C					Column D		Column E
			Additions
			(1)		(2)
	Balance at the Beginning of Period		Charged to Costs and Expenses		Charged to Other Accounts					Balance at End of Period
Description	Balance at the Beginning of Period		Charged to Costs and Expenses		Charged to Other Accounts			-Deductions-		Balance at End of Period
					Note (A)			Note (B)
Accounts receivable — allowance for doubtful accounts:
Year ended December 31, 2017	$	14,234	$	1,403	$	1,005		$	1,093	$	15,549
Year ended December 31, 2016	$	14,435	$	1,087	$	(760	)	$	528	$	14,234
Year ended December 31, 2015	$	15,961	$	883	$	(2,302	)	$	107	$	14,435
Deferred tax valuation allowance:
Year ended December 31, 2017	$	10,730	$	9,513	$	72,170		$	79,556	$	12,857
Year ended December 31, 2016	$	25,435	$	—	$	—		$	14,705	$	10,730
Year ended December 31, 2015	$	36,263	$	—	$	—		$	10,828	$	25,435

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Note (A)

For accounts receivable, amounts comprise currency translation adjustments.

For deferred tax valuation allowance in 2017, 2016, and 2015, amounts relate primarily to changes in foreign tax credit carryforwards and R&D credit carryforwards.

Note (B)

For accounts receivable, amounts represent excess of uncollectible balances written off over recoveries of accounts previously written off.

For deferred tax valuation allowance, the decrease in 2017, 2016, and 2015 relates primarily to decreases in foreign tax credit and R&D credit carryforwards.