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Net Income Attributable To IPG Photonics Corporation Per Share | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Net Income Attributable To IPG Photonics Corporation Per Share | NET INCOME ATTRIBUTABLE TO IPG PHOTONICS CORPORATION PER SHARE The following table sets forth the computation of diluted net income attributable to IPG Photonics Corporation per share:
| Year Ended December 31, |  |  |  |
| 2018 |  | 2017 |  | 2016
Net income attributable to IPG Photonics Corporation | $ | 404,027 |  | $ | 347,614 |  | $ | 260,752
Net income attributable to common stockholders | 404,027 |  | 347,614 |  | 260,752
Weighted average shares | 53,522 |  | 53,495 |  | 53,068
Dilutive effect of common stock equivalents | 1,204 |  | 1,204 |  | 729
Diluted weighted average common shares | 54,726 |  | 54,699 |  | 53,797
Basic net income attributable to IPG Photonics Corporation per share | $ | 7.55 |  | $ | 6.50 |  | $ | 4.91
Basic net income attributable to common stockholders | $ | 7.55 |  | $ | 6.50 |  | $ | 4.91
Diluted net income attributable to IPG Photonics Corporation per share | $ | 7.38 |  | $ | 6.36 |  | $ | 4.85
Diluted net income attributable to common stockholders | $ | 7.38 |  | $ | 6.36 |  | $ | 4.85
For the years ended December 31, 2018, 2017 and 2016, respectively, the computation of diluted weighted average common shares excludes common stock equivalents of 30,880 shares, 16,104 shares and 60,797 shares which includes RSU's of 19,370, 10,724 and 12,711 and PSU's of 6,310, nil and 809, because the effect would be anti-dilutive. In July 2016, the Company announced that its Board of Directors authorized a share repurchase program (the "2016 Program") to mitigate the dilutive impact of shares issued upon exercise or release under the Company's various employee and director equity compensation and employee stock purchase plans. Under the 2016 Program, the Company's management was authorized to repurchase shares of common stock in an amount not to exceed the number of shares issued to employees and directors under its various employee and director equity compensation and employee stock purchase plans from January 1, 2016 through December 31, 2017. The 2016 Program limited aggregate share repurchases to no more than $100,000 over a period ending June 30, 2018. On July 31, 2018, the Company announced that its Board of Directors authorized a new anti-dilutive stock repurchase program (the "2018 Program") following the completion of the Program. Under the 2018 Program, IPG management was authorized to repurchase shares of common stock in an amount not to exceed the greater of (a) the number of shares issued to employees and directors under the Company's various employee and director equity compensation and employee stock purchase plans from January 1, 2018 through March 31, 2019 and (b) $125,000, exclusive of any fees, commissions or other expenses. Repurchases under the 2018 Program were completed in November 2018. For the years ended December 31, 2018, 2017 and 2016, respectively, the Company repurchased 1,051,825 shares, 275,495 shares, and 102,774 shares of its common stock with an average price of $167.39, $145.15 and $87.01 per share in the open market. The impact on the reduction of weighted average shares for years ended December 31, 2018, 2017 and 2016 was 363,936 shares, 160,440 shares and 20,935 shares, respectively.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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