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CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement [Abstract]    
Sales $ 1,700,436 $ 1,533,064
Cost of sales 1,289,384 1,157,012
Gross margin 411,052 376,052
Selling, general and administrative expenses 358,908 335,775
Income from operations 52,144 40,277
Interest expense, net 26,742 36,157
Income before income taxes 25,402 4,120
Income tax expense 2,182 298
Net income 23,220 3,822
Comprehensive income $ 23,220 $ 3,822
Net income per share:    
Basic $ 0.20 $ 0.03
Diluted $ 0.20 $ 0.03
Weighted average common shares:    
Basic 114,090 111,964
Diluted 116,696 114,580