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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 835	$ 20,110	$ 2,999	$ 58,615
Unrealized gain (loss) on investments, net of tax	245	467	2,366	(904)
Comprehensive income	1,080	20,577	5,365	57,711
Comprehensive loss attributable to noncontrolling interest	(1,399)	(1,642)	(4,175)	(4,333)
Total comprehensive income attributable to InterDigital, Inc.	$ 2,479	$ 22,219	$ 9,540	$ 62,044

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