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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sales      
Sales $ 4,431,991 $ 3,911,215 $ 3,633,415
Costs and expenses      
Materials, labor, and other operating expenses (excluding depreciation) 3,819,659 3,398,433 3,153,520
Depreciation and amortization 80,379 72,847 55,578
Selling and distribution expenses 327,355 300,797 273,308
General and administrative expenses 63,068 60,585 49,425
Other (income) expense, net 377 (1,025) (1,605)
Total costs and expenses 4,290,838 3,831,637 3,530,226
Income from operations 141,153 79,578 103,189
Foreign currency exchange gain (loss) 720 119 (298)
Interest expense (25,370) (26,692) (22,532)
Interest income 547 390 323
Change in fair value of interest rate swaps 538 4,210 0
Loss on extinguishment of debt 0 (14,304) 0
Total nonoperating income (expense) (23,565) (36,277) (22,507)
Income before income taxes 117,588 43,301 80,682
Income tax provision (34,631) (5,047) (28,500)
Net Income $ 82,957 $ 38,254 $ 52,182
Weighted average common shares outstanding:      
Basic 38,623 38,761 39,239
Diluted 39,074 38,925 39,355
Net income per common share:      
Basic $ 2.15 $ 0.99 $ 1.33
Diluted $ 2.12 $ 0.98 $ 1.33