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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