Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2017

Valuation and Qualifying Accounts [Abstract]

Schedule II - Valuation and Qualifying Accounts

SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS

	Balance at Beginning of Period		Additions (Credited) Charged to Expense		Write-offs		(a) Other		Balance at End of Period
	(In thousands)
Deferred tax asset valuation allowance:
Year ended December 31, 2015	$	149,847	18,507		(248	)	(1	)	$	168,105
Year ended December 31, 2016	$	168,105	7,729		(15,091	)	4,624		$	165,367
Year ended December 31, 2017	$	165,367	(116,917	)	(489	)	35,377		$	83,338

(a) Column represents adjustments to the deferred tax asset valuation allowance established as part of the purchase accounting related to Amkor's acquisition of Nanium in 2017 and adjustments directly through stockholders’ equity for changes in accumulated other comprehensive income (loss) related to our foreign defined benefit pension plans and the adoption of ASU 2016-09 on July 1, 2016.