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Consolidated Statements of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Cumulative effect of change in accounting principle
Common Stock
Additional Paid-In Capital
Additional Paid-In Capital
Cumulative effect of change in accounting principle
Retained Earnings
Retained Earnings
Cumulative effect of change in accounting principle
Accumulated Other Comprehensive Loss
Treasury Stock
Non-Controlling Interest
Beginning balance (in shares) at Dec. 31, 2020     71,389              
Beginning balance at Dec. 31, 2020 $ 796,566 $ (39,762) $ 714 $ 738,481 $ (55,349) $ 1,413,969 $ 15,587 $ (184) $ (1,379,611) $ 23,197
Treasury stock, beginning balance (in shares) at Dec. 31, 2020                 40,573  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income attributable to InterDigital, Inc. 55,295         55,295        
Net loss attributable to noncontrolling interest (13,107)                 (13,107)
Proceeds from and increases in noncontrolling interests 100                 100
Noncontrolling interest distribution (2,512)                 (2,512)
Unrealized gain (loss) on investments, net of tax (387)             (387)    
Dividends declared (43,012)     734   (43,746)        
Exercise of common stock options (in shares)     157              
Exercise of common stock options 7,950   $ 1 7,949            
Issuance of common stock, net (in shares)     174              
Issuance of common stock, net (6,950)   $ 2 (6,952)            
Amortization of unearned compensation 28,736     28,736            
Repurchase of common stock (in shares)                 458  
Repurchase of Common Stock (30,000)               $ (30,000)  
Ending balance (in shares) at Dec. 31, 2021     71,720              
Ending balance at Dec. 31, 2021 752,917   $ 717 713,599   1,441,105   (571) $ (1,409,611) 7,678
Treasury stock, ending balance (in shares) at Dec. 31, 2021                 41,031  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income attributable to InterDigital, Inc. 93,693         93,693        
Net loss attributable to noncontrolling interest (1,632)                 (1,632)
Noncontrolling interest distribution (1,928)                 (1,928)
Non-controlling interest contributions 1,500                 1,500
Unrealized gain (loss) on investments, net of tax (345)             (345)    
Dividends declared (41,949)     803   (42,752)        
Exercise of common stock options (in shares)     24              
Exercise of common stock options 1,226     1,226            
Issuance of common stock, net (in shares)     179              
Issuance of common stock, net (6,257)   $ 2 (6,259)            
Amortization of unearned compensation 22,127     22,127            
Repurchase of common stock (in shares)                 1,224  
Repurchase of Common Stock (74,445)               $ (74,445)  
Net convertible note hedge transactions, net of tax (54,257)     (54,257)            
Net warrant transactions $ 39,863     39,863            
Ending balance (in shares) at Dec. 31, 2022 29,668   71,923              
Ending balance at Dec. 31, 2022 $ 730,513   $ 719 717,102   1,492,046   (916) $ (1,484,056) 5,618
Treasury stock, ending balance (in shares) at Dec. 31, 2022 42,255               42,255  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net income attributable to InterDigital, Inc. $ 214,069         214,069        
Net loss attributable to noncontrolling interest (3,016)                 (3,016)
Deconsolidation of Convida (4,352)                 (4,352)
Non-controlling interest contributions 1,750                 1,750
Unrealized gain (loss) on investments, net of tax 269             269    
Dividends declared $ (39,296)     1,395   (40,691)        
Exercise of common stock options (in shares) 72   72              
Exercise of common stock options $ 1,252     1,252            
Issuance of common stock, net (in shares)     251              
Issuance of common stock, net (12,507)   $ 2 (12,509)            
Amortization of unearned compensation 35,741     35,741            
Repurchase of common stock (in shares)     2,739           1,672  
Repurchase of Common Stock $ (342,874)   $ (27)     (203,354)     $ (139,493)  
Ending balance (in shares) at Dec. 31, 2023 25,580   69,507              
Ending balance at Dec. 31, 2023 $ 581,549   $ 694 $ 742,981   $ 1,462,070   $ (647) $ (1,623,549) $ 0
Treasury stock, ending balance (in shares) at Dec. 31, 2023 43,927               43,927