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Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Statement [Abstract]        
Net revenue $ 332,584 $ 282,196 $ 634,312 $ 537,865
Cost of sales 236,941 197,268 458,693 380,765
Gross profit 95,643 84,928 175,619 157,100
Operating expenses        
Selling 16,020 13,650 31,866 27,676
Administrative 44,971 41,761 89,174 81,022
Amortization 7,322 6,550 14,450 12,966
Operating income 27,330 22,967 40,129 35,436
Other expense        
Interest expense, net 5,691 4,865 9,731 7,035
Other 163 131 285 283
Income before income taxes 21,476 17,971 30,113 28,118
Income tax provision 5,161 5,998 7,404 9,781
Net income 16,315 11,973 22,709 18,337
Other comprehensive income (loss), net of tax:        
Unrealized gain (loss) on cash flow hedge, net of tax (provision) benefit of ($159) and $50 for the three months ended June 30, 2018 and 2017, respectively, and ($545) and $50 for the six months ended June 30, 2018 and 2017, respectively 475 (77) 1,635 (77)
Comprehensive income $ 16,790 $ 11,896 $ 24,344 $ 18,260
Basic and diluted net income per share $ 0.52 $ 0.38 $ 0.72 $ 0.58
Weighted average shares outstanding:        
Basic 31,345,390 31,646,460 31,447,067 31,618,624
Diluted 31,452,583 31,709,554 31,612,581 31,698,460