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Segment Information (Details) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Segment reporting information |  |
Net sales | $ 405,189,000 | $ 397,352,000
Energy and related sales, net | 1,101,000 | 1,861,000
Total revenues | 406,290,000 | 399,213,000
Cost of products sold | 348,915,000 | 338,243,000
Gross profit (loss) | 57,375,000 | 60,970,000
SG&A | 33,487,000 | 29,967,000
Gains on dispositions of plant, equipment and timberlands, net | (73,000) | (37,000)
Total operating income (loss) | 23,961,000 | 31,040,000
Non-operating expense | (3,492,000) | (3,950,000)
Income (loss) before income taxes | 20,469,000 | 27,090,000
Supplementary Data |  |
Net tons sold | 248,800,000 | 240,800,000
Depreciation, depletion and amortization | 15,358,000 | 17,086,000
Capital expenditures | 31,400,000 | 14,200,000
Specialty Papers [Member] |  |
Segment reporting information |  |
Net sales | 227,100,000 | 223,800,000
Energy and related sales, net | 1,100,000 | 1,900,000
Total revenues | 228,200,000 | 225,700,000
Cost of products sold | 195,500,000 | 188,700,000
Gross profit (loss) | 32,700,000 | 37,000,000
SG&A | 14,500,000 | 13,300,000
Gains on dispositions of plant, equipment and timberlands, net |  |
Total operating income (loss) | 18,300,000 | 23,700,000
Non-operating expense |  |
Income (loss) before income taxes | 18,300,000 | 23,700,000
Supplementary Data |  |
Net tons sold | 202,300,000 | 195,800,000
Depreciation, depletion and amortization | 8,300,000 | 8,900,000
Capital expenditures | 8,600,000 | 4,600,000
Composite Fibers [Member] |  |
Segment reporting information |  |
Net sales | 111,800,000 | 111,900,000
Energy and related sales, net |  |
Total revenues | 111,800,000 | 111,900,000
Cost of products sold | 90,400,000 | 91,500,000
Gross profit (loss) | 21,500,000 | 20,400,000
SG&A | 9,800,000 | 9,500,000
Gains on dispositions of plant, equipment and timberlands, net |  |
Total operating income (loss) | 11,600,000 | 10,900,000
Non-operating expense |  |
Income (loss) before income taxes | 11,600,000 | 10,900,000
Supplementary Data |  |
Net tons sold | 22,500,000 | 22,700,000
Depreciation, depletion and amortization | 4,600,000 | 6,000,000
Capital expenditures | 17,500,000 | 9,100,000
Advanced Airlaid Materials [Member] |  |
Segment reporting information |  |
Net sales | 66,200,000 | 61,600,000
Energy and related sales, net |  |
Total revenues | 66,200,000 | 61,600,000
Cost of products sold | 59,500,000 | 55,100,000
Gross profit (loss) | 6,700,000 | 6,500,000
SG&A | 2,200,000 | 2,600,000
Gains on dispositions of plant, equipment and timberlands, net |  |
Total operating income (loss) | 4,500,000 | 3,800,000
Non-operating expense |  |
Income (loss) before income taxes | 4,500,000 | 3,800,000
Supplementary Data |  |
Net tons sold | 23,900,000 | 22,300,000
Depreciation, depletion and amortization | 2,200,000 | 2,200,000
Capital expenditures | 2,100,000 | 500,000
Other and Unallocated [Member] |  |
Segment reporting information |  |
Net sales |  |
Energy and related sales, net |  |
Total revenues |  |
Cost of products sold | 3,500,000 | 2,900,000
Gross profit (loss) | (3,500,000) | (2,900,000)
SG&A | 7,000,000 | 4,500,000
Gains on dispositions of plant, equipment and timberlands, net | (100,000) |
Total operating income (loss) | (10,500,000) | (7,400,000)
Non-operating expense | (3,500,000) | (4,000,000)
Income (loss) before income taxes | (13,900,000) | (11,400,000)
Supplementary Data |  |
Net tons sold |  |
Depreciation, depletion and amortization | 200,000 |
Capital expenditures | $ 3,200,000 |

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