

	December 31,
	2019			2018
	(In thousands)
Deferred tax assets:
Net operating loss carryforwards	$	25,905		$	13,207
Income tax credits	98,158			107,532
Property, plant and equipment	27,199			38,050
Deferred interest expense	12,361			5,415
Accrued liabilities	61,812			68,402
Receivable	30,558			31,729
Unrealized foreign exchange loss	2,750			1,410
Operating lease liabilities	18,164			—
Other	11,889			14,545
Total deferred tax assets	288,796			280,290
Valuation allowance	(136,934		)	(118,560		)
Total deferred tax assets net of valuation allowance	151,862			161,730
Deferred tax liabilities:
Property, plant and equipment	23,747			14,605
Deferred gain	11,193			11,651
Unrealized foreign exchange gain	1,195			1,695
Unbilled receivables	3,580			9,515
Operating lease right of use assets	17,687			—
Other	4,125			5,805
Total deferred tax liabilities	61,527			43,271
Net deferred tax assets	$	90,335		$	118,459
Recognized as:
Other assets	$	90,465		$	118,697
Other non-current liabilities	(130		)	(238		)
Total	$	90,335		$	118,459

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