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Consolidated Statements of Operations - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement [Abstract] |  |  |
Net revenue | $ 1,132,927 | $ 862,980 | $ 662,719
Cost of sales | 808,901 | 610,532 | 474,426
Gross profit | 324,026 | 252,448 | 188,293
Operating expenses |  |  |
Selling | 58,450 | 49,667 | 37,702
Administrative | 164,453 | 125,472 | 99,375
Amortization | 26,857 | 11,259 | 6,264
Operating income | 74,266 | 66,050 | 44,952
Other expense (income) |  |  |
Interest expense, net | 17,381 | 6,177 | 3,738
Other | 1,065 | 263 | (716)
Income before income taxes | 55,820 | 59,610 | 41,930
Income tax provision | 14,680 | 21,174 | 15,413
Net income | 41,140 | 38,436 | 26,517
Other comprehensive income, net of tax: |  |  |
Unrealized gain on cash flow hedge, net of tax provision of $206, $0 and $0 for the twelve months ended December 31, 2017, 2016 and 2015, respectively | 507 |  |
Comprehensive income | $ 41,647 | $ 38,436 | $ 26,517
Basic and diluted net income per share | $ 1.30 | $ 1.23 | $ 0.85
Weighted average shares outstanding: |  |  |
Basic | 31,639,283 | 31,301,887 | 31,298,163
Diluted | 31,756,363 | 31,363,290 | 31,334,569

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