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Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Consolidated Statements of Income (Unaudited) [Abstract] |  |
Revenue | $ 616,219 | $ 499,099
Cost of sales | 146,281 | 111,266
Gross profit | 469,938 | 387,833
Operating expenses: |  |
Selling expenses | 257,702 | 209,008
General and administrative expenses | 153,246 | 132,563
Total operating expenses | 410,948 | 341,571
Operating income | 58,990 | 46,262
Other income (expense), net | 1,207 | (4,567)
Income before provision for income taxes | 60,197 | 41,695
Provision for income taxes | 24,658 | 14,206
Net income | $ 35,539 | $ 27,489
Net income per share (Note 2): |  |
Basic (in dollars per share) | $ 0.66 | $ 0.52
Diluted (in dollars per share) | $ 0.64 | $ 0.51
Weighted-average common shares outstanding: |  |
Basic (in shares) | 53,997 | 52,678
Diluted (in shares) | 55,959 | 54,057

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