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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Sales                      
Sales $ 876,500 $ 991,600 $ 955,400 $ 809,900 $ 862,000 $ 983,300 $ 961,200 $ 767,200 $ 3,633,415 $ 3,573,732 $ 3,273,496
Costs and expenses                      
Materials, labor, and other operating expenses (excluding depreciation)                 3,153,520 3,065,671 2,846,614
Depreciation and amortization                 55,578 51,439 38,038
Selling and distribution expenses                 273,308 264,173 245,283
General and administrative expenses                 49,425 48,489 45,489
Other (income) expense, net                 (1,605) (1,589) (685)
Total costs and expenses                 3,530,226 3,428,183 3,174,739
Income (loss) from operations 7,700 40,400 37,400 17,700 28,900 56,200 45,900 14,600 103,189 145,549 98,757
Foreign currency exchange gain (loss)                 (298) (432) (424)
Interest expense                 (22,532) (22,049) (20,426)
Interest income                 323 237 241
Total nonoperating income (expense)                 (22,507) (22,244) (20,609)
Income before income taxes                 80,682 123,305 78,148
Income tax (provision) benefit                 (28,500) (43,296) 38,788
Net Income (Loss) $ 2,300 $ 22,000 $ 20,200 $ 7,600 $ 15,700 $ 32,300 $ 26,400 $ 5,600 $ 52,182 $ 80,009 $ 116,936
Weighted average shares outstanding:                      
Basic                 39,239 39,412 40,203
Diluted                 39,355 39,492 40,226
Net income per common share:                      
Basic                 $ 1.33 $ 2.03 $ 2.91
Diluted                 $ 1.33 $ 2.03 $ 2.91