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Segment and Geographic Information (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 391,389,000 | $ 404,354,000 | $ 384,693,000 | $ 397,352,000 | $ 391,905,000 | $ 416,493,000 | $ 397,985,000 | $ 396,771,000 | $ 1,577,788,000 | $ 1,603,154,000 | $ 1,455,331,000
Energy and related sales, net |  |  |  |  |  |  |  |  | 7,000,000 | 9,344,000 | 10,653,000
Total revenues |  |  |  |  |  |  |  |  | 1,584,788,000 | 1,612,498,000 | 1,465,984,000
Costs of products sold |  |  |  |  |  |  |  |  | 1,371,139,000 | 1,406,305,000 | 1,279,737,000
Gross profit | 52,609,000 | 59,192,000 | 40,878,000 | 60,970,000 | 53,610,000 | 54,916,000 | 37,500,000 | 60,167,000 | 213,649,000 | 206,193,000 | 186,247,000
SG&A |  |  |  |  |  |  |  |  | 121,590,000 | 124,871,000 | 122,111,000
Gains on dispositions of plant, equipment and timberlands, net |  |  |  |  |  |  |  |  | (9,815,000) | (3,950,000) | (453,000)
Total operating income (loss) |  |  |  |  |  |  |  |  | 101,874,000 | 85,272,000 | 64,589,000
Non-operating expense |  |  |  |  |  |  |  |  | (22,933,000) | (34,427,000) | (31,060,000)
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 78,941,000 | 50,845,000 | 33,529,000
Supplementary Data |  |  |  |  |  |  |  |  |  |  |
Plant, equipment and timberlands, net | 621,186,000 |  |  |  | 601,950,000 |  |  |  | 621,186,000 | 601,950,000 | 608,200,000
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 69,500,000 | 69,313,000 | 65,839,000
Capital expenditures |  |  |  |  |  |  |  |  | 58,800,000 | 64,500,000 | 36,500,000
Specialty Papers [Member] |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 894,777,000 | 875,078,000 | 842,614,000
Energy and related sales, net |  |  |  |  |  |  |  |  | 7,000,000 | 9,300,000 | 10,700,000
Total revenues |  |  |  |  |  |  |  |  | 901,800,000 | 884,400,000 | 853,300,000
Costs of products sold |  |  |  |  |  |  |  |  | 779,500,000 | 775,700,000 | 740,200,000
Gross profit |  |  |  |  |  |  |  |  | 122,300,000 | 108,700,000 | 113,100,000
SG&A |  |  |  |  |  |  |  |  | 55,000,000 | 51,400,000 | 54,700,000
Total operating income (loss) |  |  |  |  |  |  |  |  | 67,300,000 | 57,300,000 | 58,400,000
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 67,300,000 | 57,300,000 | 58,400,000
Supplementary Data |  |  |  |  |  |  |  |  |  |  |
Plant, equipment and timberlands, net | 247,900,000 |  |  |  | 250,200,000 |  |  |  | 247,900,000 | 250,200,000 | 251,300,000
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 37,400,000 | 36,000,000 | 34,900,000
Capital expenditures |  |  |  |  |  |  |  |  | 23,100,000 | 31,400,000 | 24,100,000
Composite Fibers [Member] |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 436,740,000 | 476,029,000 | 419,217,000
Total revenues |  |  |  |  |  |  |  |  | 436,700,000 | 476,000,000 | 419,200,000
Costs of products sold |  |  |  |  |  |  |  |  | 362,600,000 | 395,700,000 | 350,500,000
Gross profit |  |  |  |  |  |  |  |  | 74,200,000 | 80,300,000 | 68,700,000
SG&A |  |  |  |  |  |  |  |  | 38,100,000 | 39,500,000 | 35,800,000
Total operating income (loss) |  |  |  |  |  |  |  |  | 36,100,000 | 40,800,000 | 32,900,000
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 36,100,000 | 40,800,000 | 32,900,000
Supplementary Data |  |  |  |  |  |  |  |  |  |  |
Plant, equipment and timberlands, net | 200,100,000 |  |  |  | 176,200,000 |  |  |  | 200,100,000 | 176,200,000 | 181,600,000
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 23,500,000 | 24,800,000 | 23,700,000
Capital expenditures |  |  |  |  |  |  |  |  | 31,400,000 | 22,500,000 | 8,200,000
Advanced Airlaid Materials [Member] |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 246,282,000 | 252,047,000 | 193,499,000
Total revenues |  |  |  |  |  |  |  |  | 246,300,000 | 252,000,000 | 193,500,000
Costs of products sold |  |  |  |  |  |  |  |  | 218,700,000 | 227,700,000 | 181,700,000
Gross profit |  |  |  |  |  |  |  |  | 27,600,000 | 24,300,000 | 11,800,000
SG&A |  |  |  |  |  |  |  |  | 9,600,000 | 10,900,000 | 7,400,000
Total operating income (loss) |  |  |  |  |  |  |  |  | 18,000,000 | 13,400,000 | 4,400,000
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 18,000,000 | 13,400,000 | 4,400,000
Supplementary Data |  |  |  |  |  |  |  |  |  |  |
Plant, equipment and timberlands, net | 172,900,000 |  |  |  | 175,600,000 |  |  |  | 172,900,000 | 175,600,000 | 175,300,000
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 8,700,000 | 8,500,000 | 7,200,000
Capital expenditures |  |  |  |  |  |  |  |  | 3,900,000 | 10,600,000 | 4,200,000
Other and Unallocated [Member] |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Costs of products sold |  |  |  |  |  |  |  |  | 10,300,000 | 7,200,000 | 7,400,000
Gross profit |  |  |  |  |  |  |  |  | (10,400,000) | (7,200,000) | (7,400,000)
SG&A |  |  |  |  |  |  |  |  | 18,900,000 | 23,000,000 | 24,300,000
Gains on dispositions of plant, equipment and timberlands, net |  |  |  |  |  |  |  |  | (9,800,000) | (4,000,000) | (500,000)
Total operating income (loss) |  |  |  |  |  |  |  |  | (19,500,000) | (26,200,000) | (31,200,000)
Non-operating expense |  |  |  |  |  |  |  |  | (22,900,000) | (34,400,000) | (31,100,000)
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (42,400,000) | (60,700,000) | (62,300,000)
Supplementary Data |  |  |  |  |  |  |  |  |  |  |
Plant, equipment and timberlands, net | 300,000 |  |  |  |  |  |  |  | 300,000 |  |
Capital expenditures |  |  |  |  |  |  |  |  | $ 300,000 |  |

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