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Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2017

Valuation and Qualifying Accounts [Abstract]

Schedule II - Valuation and Qualifying Accounts

MKS INSTRUMENTS, INC.

SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS


						Additions
Description		Balance at Beginning of Year				Acquisition Beginning Balance				Charged to Costs and Expenses				Charged to Other Accounts				Deductions & Write-offs				Balance at End of Year
		(in thousands)
Allowance for doubtful accounts:
Years ended December 31,
2017		$	3,909			$	—			$	825			$	—			$	(599	)		$	4,135
2016		$	1,760			$	1,292			$	1,109			$	(66	)		$	(186	)		$	3,909
2015		$	2,250			$	—			$	(255	)		$	21			$	(256	)		$	1,760


						Additions
Description		Balance at Beginning of Year				Acquisition Beginning Balance				Charged to Costs and Expenses				Charged to Other Accounts				Deductions & Write-offs				Balance at End of Year
		(in thousands)
Allowance for sales returns:
Years ended December 31,
2017		$	1,138			$	—			$	(142	)		$	—			$	299			$	1,295
2016		$	601			$	423			$	2,262			$	—			$	(2,148	)		$	1,138
2015		$	730			$	—			$	2,500			$	(3	)		$	(2,626	)		$	601


						Additions
Description		Balance at Beginning of Year				Acquisition Beginning Balance				Charged to Costs and Expenses				Charged to Other Accounts				Deductions				Balance at End of Year
		(in thousands)
Valuation allowance on deferred tax asset:
Years ended December 31,
2017		$	12,527			$	—			$	1,603			$	—			$	(501	)		$	13,629
2016		$	6,127			$	3,769			$	2,719			$	—			$	(88	)		$	12,527
2015		$	26,763			$	—			$	—			$	113			$	(20,749	)		$	6,127