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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Income Statement [Abstract] |  |  |  |
Revenue | $ 190,061 | $ 139,239 | $ 543,040 | $ 355,159
Cost of sales | 47,128 | 32,038 | 134,250 | 84,351
Gross profit | 142,933 | 107,201 | 408,790 | 270,808
Selling, general, and administrative | 122,671 | 89,734 | 336,458 | 221,548
Income from operations | 20,262 | 17,467 | 72,332 | 49,260
Other income (expense) |  |  |  |
Interest income, net | 324 | 361 | 1,061 | 940
Other income (expense) | (3) |  | (11) | 178
Other income (expense) | 321 | 361 | 1,050 | 1,118
Income from operations before income taxes | 20,583 | 17,828 | 73,382 | 50,378
Provision for income taxes | 4,681 | 4,047 | 15,347 | 10,242
Net income | $ 15,902 | $ 13,781 | $ 58,035 | $ 40,136
Basic earnings per share |  |  |  |
Earnings per share, basic | $ 1.36 | $ 1.15 | $ 4.91 | $ 3.34
Diluted earnings per share |  |  |  |
Earnings per share, diluted | $ 1.32 | $ 1.14 | $ 4.77 | $ 3.31
Weighted average shares outstanding - |  |  |  |
Basic | 11,731 | 11,954 | 11,823 | 12,006
Diluted | 12,065 | 12,097 | 12,174 | 12,112
Cash dividends declared per share | $ 0.75 | $ 0.48 | $ 2.25 | $ 1.44

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