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Consolidated Statements Of Equity - USD ($) $ in Thousands | Total | TOTAL IPG PHOTONICS CORPORATION EQUITY | COMMON STOCK | TREASURY STOCK | ADDITIONAL PAID-IN CAPITAL | RETAINED EARNINGS | ACCUMULATED OTHER COMPREHENSIVE LOSS | NONCONTROLLING INTERESTS ("NCI")
--- | --- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Effect of adopted accounting standards |  |  |  |  | $ 2,078 | $ 2,145 |  |
Balance, beginning of year (in shares) at Dec. 31, 2016 |  |  | (53,251,805) | (102,774) |  |  |  |
Balance, beginning of year at Dec. 31, 2016 |  |  | $ 5 | $ (8,946) | 650,974 | 1,094,108 | $ (178,583) | $ 166
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Exercise of stock options and conversion of restricted stock units (in shares) |  |  | 543,547 |  |  |  |  |
Exercise of stock options and conversion of restricted stock units |  |  | $ 0 |  |  |  |  |
Common stock issued under employee stock purchase plan (in shares) |  |  | 19,882 |  |  |  |  |
Common stock issued under employee stock purchase plan |  |  | $ 0 |  | 1,669 |  |  |
Purchased common stock (in shares) |  |  | (215,860) | (215,860) |  |  |  |
Purchased common stock |  |  | $ 0 | $ (26,911) |  |  |  |
Stock-based compensation |  |  |  |  | 16,989 |  |  |
Common stock issued under employee stock option plan, net of shares withheld for employee taxes |  |  |  |  | 21,627 |  |  |
Net income attributable to IPG Photonics Corporation | $ 294,658 |  |  |  |  | 294,658 |  |
Translation adjustments | 89,076 |  |  |  |  |  | 89,023 | 57
Unrealized loss on derivatives, net of tax | (35) |  |  |  |  |  | (35) |
Unrealized loss on available-for-sale investments, net of tax | 298 |  |  |  |  |  | (240) |
Realized loss on available-for-sale investments, net of tax, reclassified to net income |  |  |  |  |  |  | 538 |
Noncontrolling interest of acquired company |  |  |  |  |  |  |  | (197)
Net income (loss) attributable to NCI | (26) |  |  |  |  |  |  | (26)
Balance, end of period (in shares) at Sep. 30, 2017 |  |  | (53,599,374) | (318,634) |  |  |  |
Balance, end of period at Sep. 30, 2017 | 1,959,099 | $ 1,959,099 | $ 5 | $ (35,857) | 693,337 | 1,390,911 | (89,297) | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Effect of adopted accounting standards |  |  |  |  | 0 | 606 | 10 |
Balance, beginning of year (in shares) at Dec. 31, 2017 |  |  | (53,629,439) | (378,269) |  |  |  |
Balance, beginning of year at Dec. 31, 2017 | 2,022,322 |  | $ 5 | $ (48,933) | 704,727 | 1,443,867 | (77,344) | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Exercise of stock options and conversion of restricted stock units (in shares) |  |  | 342,673 |  |  |  |  |
Exercise of stock options and conversion of restricted stock units |  |  | $ 0 |  |  |  |  |
Common stock issued under employee stock purchase plan (in shares) |  |  | 12,198 |  |  |  |  |
Common stock issued under employee stock purchase plan |  |  | $ 0 |  | 2,288 |  |  |
Purchased common stock (in shares) |  |  | (585,806) | (585,806) |  |  |  |
Purchased common stock |  |  | $ 0 | $ (111,926) |  |  |  |
Stock-based compensation |  |  |  |  | 21,443 |  |  |
Common stock issued under employee stock option plan, net of shares withheld for employee taxes |  |  |  |  | 9,827 |  |  |
Net income attributable to IPG Photonics Corporation | 328,468 |  |  |  |  | 328,468 |  |
Translation adjustments | (67,072) |  |  |  |  |  | (67,072) | (39)
Unrealized loss on derivatives, net of tax | (3) |  |  |  |  |  | (3) |
Unrealized loss on available-for-sale investments, net of tax | 0 |  |  |  |  |  | 0 |
Realized loss on available-for-sale investments, net of tax, reclassified to net income |  |  |  |  |  |  | 0 |
Noncontrolling interest of acquired company |  |  |  |  |  |  |  | 649
Net income (loss) attributable to NCI | 235 |  |  |  |  |  |  | 235
Balance, end of period (in shares) at Sep. 30, 2018 |  |  | (53,398,504) | (964,075) |  |  |  |
Balance, end of period at Sep. 30, 2018 | $ 2,206,808 | $ 2,205,963 | $ 5 | $ (160,859) | $ 738,285 | $ 1,772,941 | $ (144,409) | $ 845

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