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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)

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