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Supplemental Guarantor Financial Information Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 470,159 | $ 487,845 | $ 471,002 | $ 460,824 | $ 462,701 | $ 480,233 | $ 473,572 | $ 457,798 | $ 1,889,830 |  | $ 1,874,304 | $ 1,927,973
Cost and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales | (401,404) | (441,237) | (414,521) | (414,209) | (396,428) | (409,822) | (398,546) | (403,076) | (1,671,371) |  | (1,607,872) | (1,702,530)
Selling, general and administrative expenses | (30,466) | (27,766) | (26,767) | (34,132) | (30,793) | (30,649) | (30,529) | (29,074) | (119,131) |  | (121,045) | (109,998)
Total operating costs and expenses | (431,870) | (469,003) | (441,288) | (448,341) | (427,221) | (440,471) | (429,075) | (432,150) | (1,790,502) |  | (1,728,917) | (1,812,528)
Income from operations | 38,289 | 18,842 | 29,714 | 12,483 | 35,480 | 39,762 | 44,497 | 25,648 | 99,328 |  | 145,387 | 115,445
Interest expense, net |  |  |  |  |  |  |  |  | (44,036) |  | (33,796) | (44,809)
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  | (17,058) |  | 0 | 0
Other, net |  |  |  |  |  |  |  |  | 0 |  | 0 | 284
Equity in income (loss) of subsidiary |  |  |  |  |  |  |  |  | 0 |  |  |
Earnings before income taxes |  |  |  |  |  |  |  |  | 38,234 |  | 111,591 | 70,920
Income tax (provision) benefit |  |  |  |  |  |  |  |  | 68,721 |  | (47,460) | (31,246)
Net earnings | 82,862 | 13,317 | 11,658 | (882) | 19,852 | 19,064 | 21,489 | 3,726 | 106,955 |  | 64,131 | 39,674
Other comprehensive income, net of tax |  |  |  |  |  |  |  |  | 57,600 | [1] | (428) | (16,913)
Comprehensive income |  |  |  |  |  |  |  |  | 164,555 |  | 63,703 | 22,761
Issuer |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,408,941 |  | 1,375,732 | 1,464,570
Cost and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | (1,203,945) |  | (1,149,413) | (1,256,507)
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | (94,861) |  | (96,668) | (61,794)
Total operating costs and expenses |  |  |  |  |  |  |  |  | (1,298,806) |  | (1,246,081) | (1,318,301)
Income from operations |  |  |  |  |  |  |  |  | 110,135 |  | 129,651 | 146,269
Interest expense, net |  |  |  |  |  |  |  |  | (44,031) |  | (33,796) | (44,187)
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  | (17,058) |  |  |
Other, net |  |  |  |  |  |  |  |  |  |  |  | (215)
Equity in income (loss) of subsidiary |  |  |  |  |  |  |  |  | (15,370) |  | 1,339 | (31,542)
Earnings before income taxes |  |  |  |  |  |  |  |  | 49,046 |  | 95,855 | 101,867
Income tax (provision) benefit |  |  |  |  |  |  |  |  | 61,778 |  | (42,440) | (34,018)
Net earnings |  |  |  |  |  |  |  |  | 95,454 |  | 54,754 | 36,307
Other comprehensive income, net of tax |  |  |  |  |  |  |  |  | 57,600 |  | (428) | (16,913)
Comprehensive income |  |  |  |  |  |  |  |  | 153,054 |  | 54,326 | 19,394
Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 480,599 |  | 492,074 | 508,341
Cost and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | (467,822) |  | (454,383) | (493,338)
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | (22,918) |  | (22,268) | (44,481)
Total operating costs and expenses |  |  |  |  |  |  |  |  | (490,740) |  | (476,651) | (537,819)
Income from operations |  |  |  |  |  |  |  |  | (10,141) |  | 15,423 | (29,478)
Interest expense, net |  |  |  |  |  |  |  |  | (5) |  | 0 | (622)
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  | 0 |  |  |
Other, net |  |  |  |  |  |  |  |  |  |  |  | 388
Equity in income (loss) of subsidiary |  |  |  |  |  |  |  |  | (804) |  | 278 | (3,687)
Earnings before income taxes |  |  |  |  |  |  |  |  | (10,146) |  | 15,423 | (29,712)
Income tax (provision) benefit |  |  |  |  |  |  |  |  | (4,420) |  | (14,362) | 1,857
Net earnings |  |  |  |  |  |  |  |  | (15,370) |  | 1,339 | (31,542)
Comprehensive income |  |  |  |  |  |  |  |  | (15,370) |  | 1,339 | (31,542)
Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 29,494 |  | 26,478 | 32,977
Cost and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | (28,808) |  | (24,056) | (30,600)
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | (1,352) |  | (2,109) | (3,723)
Total operating costs and expenses |  |  |  |  |  |  |  |  | (30,160) |  | (26,165) | (34,323)
Income from operations |  |  |  |  |  |  |  |  | (666) |  | 313 | (1,346)
Interest expense, net |  |  |  |  |  |  |  |  |  |  | 0 | 0
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  | 0 |  |  |
Other, net |  |  |  |  |  |  |  |  |  |  |  | 111
Equity in income (loss) of subsidiary |  |  |  |  |  |  |  |  | 0 |  |  |
Earnings before income taxes |  |  |  |  |  |  |  |  | (666) |  | 313 | (1,235)
Income tax (provision) benefit |  |  |  |  |  |  |  |  | (138) |  | (35) | (2,452)
Net earnings |  |  |  |  |  |  |  |  | (804) |  | 278 | (3,687)
Comprehensive income |  |  |  |  |  |  |  |  | (804) |  | 278 | (3,687)
Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | (29,204) |  | (19,980) | (77,915)
Cost and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | 29,204 |  |  | 77,915
Total operating costs and expenses |  |  |  |  |  |  |  |  | 29,204 |  | 19,980 | 77,915
Income from operations |  |  |  |  |  |  |  |  | 0 |  | 0 | 0
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  | 0 |  |  |
Other, net |  |  |  |  |  |  |  |  |  |  |  | 0
Equity in income (loss) of subsidiary |  |  |  |  |  |  |  |  | 16,174 |  | (1,617) | 35,229
Earnings before income taxes |  |  |  |  |  |  |  |  | 0 |  | 0 | 0
Income tax (provision) benefit |  |  |  |  |  |  |  |  | 11,501 |  | 9,377 | 3,367
Net earnings |  |  |  |  |  |  |  |  | 27,675 |  | 7,760 | 38,596
Comprehensive income |  |  |  |  |  |  |  |  | $ 27,675 |  | $ 7,760 | $ 38,596
[1] | 2Net periodic costs associated with our pension and other postretirement employee benefit plans included in other comprehensive income and reclassified from accumulated other comprehensive loss includes $83.6 million of net gain on plan assets, $14.8 million of actuarial loss amortization, $5.1 million of prior service costs arising during the period, $0.8 million of curtailments and $0.2 million related to prior service credit, net of tax of $36.3 million. These accumulated other comprehensive loss components are included in the computation of net periodic pension and OPEB costs in Note 12, “Pension and Other Postretirement Employee Benefit Plans.”

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