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Revenue Recognition - Statement of Operations Impact (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jul. 01, 2018 | Apr. 01, 2018 | Dec. 31, 2017 | Oct. 01, 2017 | Jul. 02, 2017 | Apr. 02, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 193,286 | $ 232,221 | $ 211,264 | $ 169,567 | $ 182,922 | $ 266,042 | $ 178,080 | $ 139,039 | $ 806,338 | $ 766,083 | $ 529,515
Cost of revenue |  |  |  |  |  |  |  |  | 206,052 | 187,289 | 131,070
Gross margin | 140,461 | 173,361 | 157,095 | 129,369 | 138,390 | 197,981 | 135,916 | 106,507 | 600,286 | 578,794 | 398,445
Operating income | 45,247 | 77,844 | 63,455 | 34,596 | 50,775 | 110,849 | 60,021 | 37,216 | 221,142 | 258,861 | 154,066
Income before income tax expense |  |  |  |  |  |  |  |  | 234,574 | 266,464 | 162,077
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 15,307 | 89,752 | 18,128
Net income | $ 45,418 | $ 80,436 | $ 56,196 | $ 37,217 | $ (27,747) | $ 102,493 | $ 56,495 | $ 45,471 | $ 219,267 | $ 176,712 | $ 143,694
Net income per weighted-average common and common-equivalent share: |  |  |  |  |  |  |  |  |  |  |
Net income (in dollars per share) | $ 0.26 | $ 0.47 | $ 0.33 | $ 0.21 | $ (0.16) | $ 0.59 | $ 0.33 | $ 0.26 | $ 1.27 | $ 1.02 | $ 0.84
Net income (in dollars per share) | $ 0.26 | $ 0.45 | $ 0.32 | $ 0.21 | $ (0.16) | $ 0.57 | $ 0.32 | $ 0.25 | $ 1.24 | $ 0.98 | $ 0.83
As previously reported |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | $ 747,950 | $ 520,753
Cost of revenue |  |  |  |  |  |  |  |  |  | 168,698 | 115,590
Gross margin |  |  |  |  |  |  |  |  |  | 579,252 | 405,163
Operating income |  |  |  |  |  |  |  |  |  | 259,319 | 160,784
Income before income tax expense |  |  |  |  |  |  |  |  |  | 266,922 | 168,795
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 89,744 | 18,968
Net income |  |  |  |  |  |  |  |  |  | $ 177,178 | $ 149,572
Net income per weighted-average common and common-equivalent share: |  |  |  |  |  |  |  |  |  |  |
Net income (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 1.02 | $ 0.88
Net income (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.99 | $ 0.86
Adjustment [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | $ 18,133 | $ 8,762
Cost of revenue |  |  |  |  |  |  |  |  |  | 18,591 | 15,480
Gross margin |  |  |  |  |  |  |  |  |  | (458) | (6,718)
Operating income |  |  |  |  |  |  |  |  |  | (458) | (6,718)
Income before income tax expense |  |  |  |  |  |  |  |  |  | (458) | (6,718)
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 8 | (840)
Net income |  |  |  |  |  |  |  |  |  | $ (466) | $ (5,878)
Net income per weighted-average common and common-equivalent share: |  |  |  |  |  |  |  |  |  |  |
Net income (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.00 | $ (0.04)
Net income (in dollars per share) |  |  |  |  |  |  |  |  |  | $ (0.01) | $ (0.03)

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