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Condensed Consolidated Statements of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Non-Controlling Interest
Ending balance (in shares) at Dec. 31, 2017   70,749       36,127  
Ending balance at Dec. 31, 2017 $ 873,148 $ 707 $ 680,040 $ 1,257,632 $ (2,083) $ (1,072,488) $ 9,340
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (income) attributable to InterDigital, Inc. 30,230     30,230      
Net loss attributable to noncontrolling interest (1,501)           (1,501)
Net change in unrealized gain (loss) on short-term investments (1,747)       (1,747)    
Dividends declared (12,165)   115 (12,280)      
Issuance of common stock, net (in shares)   208          
Issuance of common stock, net (8,277) $ 2 (8,279)        
Amortization of unearned compensation 816   816        
Repurchase of common stock (in shares)           84  
Repurchase of common stock (6,024)         $ (6,024)  
Ending balance (in shares) at Mar. 31, 2018   70,957       36,211  
Ending balance at Mar. 31, 2018 1,035,732 $ 709 672,692 1,437,283 (4,279) $ (1,078,512) 7,839
Beginning balance (in shares) at Dec. 31, 2017   70,749       36,127  
Beginning balance at Dec. 31, 2017 873,148 $ 707 680,040 1,257,632 (2,083) $ (1,072,488) 9,340
Ending balance (in shares) at Jun. 30, 2018   71,059       36,251  
Ending balance at Jun. 30, 2018 1,036,224 $ 710 678,434 1,435,994 (3,903) $ (1,081,660) 6,649
Beginning balance (in shares) at Dec. 31, 2017   70,749       36,127  
Beginning balance at Dec. 31, 2017 873,148 $ 707 680,040 1,257,632 (2,083) $ (1,072,488) 9,340
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (income) attributable to InterDigital, Inc. 62,948            
Net loss attributable to noncontrolling interest (4,333)            
Net change in unrealized gain (loss) on short-term investments (904)            
Ending balance (in shares) at Sep. 30, 2018   71,117       36,675  
Ending balance at Sep. 30, 2018 1,015,049 $ 711 683,140 1,445,622 (3,436) $ (1,115,995) 5,007
Beginning balance (in shares) at Dec. 31, 2017   70,749       36,127  
Beginning balance at Dec. 31, 2017 873,148 $ 707 680,040 1,257,632 (2,083) $ (1,072,488) 9,340
Ending balance (in shares) at Dec. 31, 2018   71,134       37,605  
Ending balance at Dec. 31, 2018 938,013 $ 711 685,512 1,435,970 (2,471) $ (1,182,993) 1,284
Beginning balance (in shares) at Mar. 31, 2018   70,957       36,211  
Beginning balance at Mar. 31, 2018 1,035,732 $ 709 672,692 1,437,283 (4,279) $ (1,078,512) 7,839
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (income) attributable to InterDigital, Inc. 10,966     10,966      
Net loss attributable to noncontrolling interest (1,190)           (1,190)
Net change in unrealized gain (loss) on short-term investments 376       376    
Dividends declared (12,153)   102 (12,255)      
Exercise of common stock options (in shares)   90          
Exercise of common stock options 3,931 $ 1 3,930        
Issuance of common stock, net (in shares)   12          
Issuance of common stock, net (111)   (111)        
Amortization of unearned compensation 1,821   1,821        
Repurchase of common stock (in shares)           40  
Repurchase of common stock (3,148)         $ (3,148)  
Ending balance (in shares) at Jun. 30, 2018   71,059       36,251  
Ending balance at Jun. 30, 2018 1,036,224 $ 710 678,434 1,435,994 (3,903) $ (1,081,660) 6,649
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (income) attributable to InterDigital, Inc. 21,752     21,752      
Net loss attributable to noncontrolling interest (1,642)           (1,642)
Net change in unrealized gain (loss) on short-term investments 467       467    
Dividends declared (11,997)   127 (12,124)      
Exercise of common stock options (in shares)   56          
Exercise of common stock options 2,432 $ 1 2,431        
Issuance of common stock, net (in shares)   2          
Issuance of common stock, net (91)   (91)        
Amortization of unearned compensation 2,239   2,239        
Repurchase of common stock (in shares)           424  
Repurchase of common stock (34,335)         $ (34,335)  
Ending balance (in shares) at Sep. 30, 2018   71,117       36,675  
Ending balance at Sep. 30, 2018 1,015,049 $ 711 683,140 1,445,622 (3,436) $ (1,115,995) 5,007
Ending balance (in shares) at Dec. 31, 2018   71,134       37,605  
Ending balance at Dec. 31, 2018 938,013 $ 711 685,512 1,435,970 (2,471) $ (1,182,993) 1,284
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (income) attributable to InterDigital, Inc. (2,803)     (2,803)      
Proceeds from and increases in noncontrolling interests 12,834           12,834
Net loss attributable to noncontrolling interest (1,411)           (1,411)
Net change in unrealized gain (loss) on short-term investments 1,045       1,045    
Dividends declared (11,180)   103 (11,283)      
Exercise of common stock options 2   2        
Issuance of common stock, net (in shares)   116          
Issuance of common stock, net (4,097) $ 1 (4,098)        
Amortization of unearned compensation 2,096   2,096        
Repurchase of common stock (in shares)           1,585  
Repurchase of common stock (108,986)         $ (108,986)  
Ending balance (in shares) at Mar. 31, 2019   71,250       39,190  
Ending balance at Mar. 31, 2019 825,513 $ 712 683,615 1,421,884 (1,426) $ (1,291,979) 12,707
Beginning balance (in shares) at Dec. 31, 2018   71,134       37,605  
Beginning balance at Dec. 31, 2018 938,013 $ 711 685,512 1,435,970 (2,471) $ (1,182,993) 1,284
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (income) attributable to InterDigital, Inc. 7,174            
Net loss attributable to noncontrolling interest (4,175)            
Net change in unrealized gain (loss) on short-term investments 2,366            
Ending balance (in shares) at Sep. 30, 2019   71,267       40,134  
Ending balance at Sep. 30, 2019 803,299 $ 712 725,891 1,409,870 (105) $ (1,354,262) 21,193
Beginning balance (in shares) at Mar. 31, 2019   71,250       39,190  
Beginning balance at Mar. 31, 2019 825,513 $ 712 683,615 1,421,884 (1,426) $ (1,291,979) 12,707
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (income) attributable to InterDigital, Inc. 7,743     7,743      
Net loss attributable to noncontrolling interest             (1,365)
Net change in unrealized gain (loss) on short-term investments 1,076       1,076    
Dividends declared (10,895)   104 (10,999)      
Issuance of common stock, net (in shares)   10          
Issuance of common stock, net (40)   (40)        
Amortization of unearned compensation 2,116   2,116        
Repurchase of common stock (in shares)           944  
Repurchase of common stock (62,283)         $ (62,283)  
Equity component of debt, net of tax 56,917   56,917        
Net convertible note hedge transactions, net of tax (49,740)   (49,740)        
Net warrant transactions 43,416   43,416        
Deferred financing costs allocated to equity, net of tax (1,569)   (1,569)        
Reacquisition of equity component of debt due to prepayment, net of tax (10,649)   (10,649)        
Ending balance (in shares) at Jun. 30, 2019   71,260       40,134  
Ending balance at Jun. 30, 2019 800,240 $ 712 724,170 1,418,628 (350) $ (1,354,262) 11,342
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (income) attributable to InterDigital, Inc. 2,234     2,234      
Proceeds from and increases in noncontrolling interests 11,250           11,250
Net loss attributable to noncontrolling interest (1,399)           (1,399)
Net change in unrealized gain (loss) on short-term investments 245       245    
Dividends declared (10,897)   95 (10,992)      
Issuance of common stock, net (in shares)   7          
Issuance of common stock, net (179)   (179)        
Amortization of unearned compensation 1,805   1,805        
Ending balance (in shares) at Sep. 30, 2019   71,267       40,134  
Ending balance at Sep. 30, 2019 $ 803,299 $ 712 $ 725,891 $ 1,409,870 $ (105) $ (1,354,262) $ 21,193