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Supplemental Guarantor Financial Information Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) (Details) - USD ($)
$ 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
Condensed Financial Statements, Captions [Line Items]                      
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
Cost 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
Interest expense, net                 (31,374) (30,651) (31,182)
Equity in income (loss) of subsidiary                 0 0 0
Earnings before income taxes                 40,954 80,666 92,488
Income tax (provision) benefit                 56,385 (31,112) (36,505)
Net earnings $ 80,924 $ 863 $ 8,037 $ 7,515 $ 9,343 $ 901 $ 20,864 $ 18,446 97,339 49,554 55,983
Other comprehensive income, net of tax                 7,770 3,795 15,315
Comprehensive income                 105,109 53,349 71,298
Issuer                      
Condensed Financial Statements, Captions [Line Items]                      
Net sales                 1,707,283 1,685,327 1,683,890
Cost and expenses:                      
Cost of sales                 (1,524,925) (1,468,691) (1,458,121)
Selling, general and administrative expenses                 (97,989) (113,766) (108,414)
Total operating costs and expenses                 (1,622,914) (1,582,457) (1,566,535)
Income from operations                 84,369 102,870 117,355
Interest expense, net                 (30,820) (30,462) (31,067)
Equity in income (loss) of subsidiary                 11,911 5,331 2,476
Earnings before income taxes                 53,549 72,408 86,288
Income tax (provision) benefit                 34,250 (26,966) (32,371)
Net earnings                 99,710 50,773 56,393
Other comprehensive income, net of tax                 7,770 3,795 15,315
Comprehensive income                 107,480 54,568 71,708
Guarantor Subsidiaries                      
Condensed Financial Statements, Captions [Line Items]                      
Net sales                 242,222 287,952 291,270
Cost and expenses:                      
Cost of sales                 (219,931) (263,577) (277,487)
Selling, general and administrative expenses                 (30,470) (14,053) (7,468)
Total operating costs and expenses                 (250,401) (277,630) (284,955)
Income from operations                 (8,179) 10,322 6,315
Interest expense, net                 (554) (189) (115)
Equity in income (loss) of subsidiary                 0 0 0
Earnings before income taxes                 (8,733) 10,133 6,200
Income tax (provision) benefit                 20,644 (4,802) (3,724)
Net earnings                 11,911 5,331 2,476
Other comprehensive income, net of tax                 0 0 0
Comprehensive income                 11,911 5,331 2,476
Eliminations                      
Condensed Financial Statements, Captions [Line Items]                      
Net sales                 (219,097) (238,516) (222,759)
Cost and expenses:                      
Cost of sales                 215,235 236,641 222,759
Selling, general and administrative expenses                 0 0 0
Total operating costs and expenses                 215,235 236,641 222,759
Income from operations                 (3,862) (1,875) 0
Interest expense, net                 0 0 0
Equity in income (loss) of subsidiary                 (11,911) (5,331) (2,476)
Earnings before income taxes                 (3,862) (1,875) 0
Income tax (provision) benefit                 1,491 656 (410)
Net earnings                 (14,282) (6,550) (2,886)
Other comprehensive income, net of tax                 0 0 0
Comprehensive income                 $ (14,282) $ (6,550) $ (2,886)