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Financial Results by Quarter Financial Results by Quarter (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 436,716 $ 426,504 $ 429,663 $ 437,525 $ 425,568 $ 435,320 $ 436,671 $ 437,204 $ 1,730,408 $ 1,734,763 $ 1,752,401
Costs and expenses:                      
Cost of sales (375,277) (386,581) (380,733) (387,030) (368,524) (396,605) (361,851) (368,647) (1,529,621) (1,495,627) (1,512,849)
Selling, general and administrative expenses (34,785) (34,472) (29,265) (29,937) (32,934) (29,435) (34,655) (30,795) (128,459) (127,819) (115,882)
Total operating costs and expenses (410,062) (421,053) (409,998) (416,967) (401,458) (426,040) (396,506) (399,442) (1,658,080) (1,623,446) (1,628,731)
Income from operations 26,654 5,451 19,665 20,558 24,110 9,280 40,165 37,762 72,328 111,317 123,670
Net earnings $ 80,924 $ 863 $ 8,037 $ 7,515 $ 9,343 $ 901 $ 20,864 $ 18,446 $ 97,339 $ 49,554 $ 55,983
Net earnings per common share:                      
Basic (in dollars per share) $ 4.92 $ 0.05 $ 0.49 $ 0.46 $ 0.56 $ 0.05 $ 1.22 $ 1.05 $ 5.91 $ 2.91 $ 2.98
Diluted (in dollars per share) $ 4.88 $ 0.05 $ 0.48 $ 0.45 $ 0.56 $ 0.05 $ 1.21 $ 1.05 $ 5.88 $ 2.90 $ 2.97