Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues	$ 318,924	$ 307,404	$ 532,938
OPERATING EXPENSES:
Patent administration and licensing	154,940	124,081	102,651
Development	74,860	69,698	75,724
Selling, general and administrative	51,289	51,030	53,068
Total Operating Expenses	281,089	244,809	231,443
Income from operations	37,835	62,595	301,495
Interest expense	(40,955)	(35,956)	(17,845)
OTHER INCOME (EXPENSE), NET	29,062	5,419	8,740
Income before income taxes	25,942	32,058	292,390
INCOME TAX BENEFIT (PROVISION)	(10,991)	27,417	(121,676)
NET INCOME	14,951	59,475	170,714
Net loss attributable to noncontrolling interest	(5,977)	(5,556)	(5,506)
NET INCOME ATTRIBUTABLE TO INTERDIGITAL, INC.	$ 20,928	$ 65,031	$ 176,220
Net income per share — basic (in usd per share)	$ 0.66	$ 1.89	$ 5.09
Weighted average number of common shares outstanding — basic (in shares)	31,546	34,491	34,605
Net income per share — diluted (in usd per share)	$ 0.66	$ 1.84	$ 4.93
Weighted average number of common shares outstanding — diluted (in shares)	31,785	35,307	35,779
CASH DIVIDENDS DECLARED PER COMMON SHARE (in usd per share)	$ 1.40	$ 1.40	$ 1.30
Patent licensing royalties
Revenues	$ 307,431	$ 302,060	$ 512,358
Patent sales
Revenues	975	750	0
Technology solutions
Revenues	$ 10,518	$ 4,594	$ 20,580