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Selected Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2018
Selected Quarterly Financial Information [Abstract] |
Selected Quarterly Financial Data (Unaudited) | SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)
2018 |  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Net sales |  | $ | 359,864 |  | $ | 413,613 |  | $ | 356,346 |  | $ | 330,051
Gross profit |  | 203,362 |  | 234,975 |  | 195,184 |  | 166,747
Net income attributable to IPG Photonics Corporation |  | 106,334 |  | 121,617 |  | 100,517 |  | 75,559
Basic earnings per share |  | 1.98 |  | 2.27 |  | 1.88 |  | 1.42
Diluted earnings per share |  | 1.93 |  | 2.21 |  | 1.84 |  | 1.40
2017 |  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Net sales |  | $ | 285,846 |  | $ | 369,373 |  | $ | 392,615 |  | $ | 361,055
Gross profit |  | 157,267 |  | 206,296 |  | 224,555 |  | 208,793
Net income attributable to IPG Photonics Corporation |  | 74,945 |  | 104,116 |  | 115,597 |  | 52,956
Basic earnings per share |  | 1.40 |  | 1.95 |  | 2.16 |  | 0.99
Diluted earnings per share |  | 1.38 |  | 1.91 |  | 2.11 |  | 0.96
Net income attributable to IPG Photonics Corporation as well as basic and diluted earnings per share in the fourth quarter of the year ended December 31, 2017 were impacted by the legislation that enacted the Tax Act. Refer to Note 14 for further explanation.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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