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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

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