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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Statement [Abstract] |  |  |
Total revenue, net | $ 1,472,441 | $ 1,188,236 | $ 992,075
Costs and Expenses: |  |  |
Cost of goods sold | 571,496 | 435,511 | 349,089
Research and development | 78,041 | 63,455 | 58,155
Selling, general and administrative | 690,746 | 624,096 | 455,629
Intangible asset amortization | 21,160 | 20,370 | 13,862
Total costs and expenses | 1,361,443 | 1,143,432 | 876,735
Operating income | 110,998 | 44,804 | 115,340
Interest income | 2,800 | 255 | 24
Interest expense | (64,683) | (35,019) | (25,803)
Other income, net | 8,288 | 1,345 | 845
Income before income taxes | 57,403 | 11,385 | 90,406
(Benefit from) provision for income taxes | (3,398) | (53,358) | 15,842
Net income | $ 60,801 | $ 64,743 | $ 74,564
Basic net income per common share (in dollars per share) | $ 0.73 | $ 0.84 | $ 1.00
Diluted net income per common share (in dollars per share) | $ 0.72 | $ 0.82 | $ 0.94
Weighted average common shares outstanding (See Note 13): |  |  |
Basic (in shares) | 82,857 | 76,897 | 74,386
Diluted (in shares) | 83,999 | 79,121 | 79,194

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