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Summary of Significant Accouting Policies Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended | 24 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 | Dec. 31, 2017 | Dec. 16, 2016 | Dec. 15, 2015 | Dec. 27, 2010
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ 15,700 |  |  |  | $ 23,000 |  |  |  | $ 15,700 | $ 23,000 |  | $ 15,700 |  |  |
Allowance for doubtful accounts | 1,400 |  |  |  | 1,500 |  |  |  | 1,400 | 1,500 |  | 1,400 |  |  |
Provision for doubtful accounts |  |  |  |  |  |  |  |  | 200 | 700 | $ 200 |  |  |  |
Goodwill | 244,161 |  |  |  | 244,283 |  |  |  | 244,161 | 244,283 |  | 244,161 |  |  |
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 |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 29,800 |  |  |  |  |  |  |  | $ 29,800 |  |  | $ 29,800 |  |  |
Percentage of expected natural gas requirement covered under contract for next fiscal year | 17.00% |  |  |  |  |  |  |  | 17.00% |  |  | 17.00% |  |  |
Percentage Of Expected Natural Gas Requirement Covered Under Contract For Next Fiscal Quarter | 30.00% |  |  |  |  |  |  |  | 30.00% |  |  | 30.00% |  |  |
Percentage of natural gas requirement covered under contract |  |  |  |  |  |  |  |  | 28.00% | 45.00% | 57.00% |  |  |  |
Other Nonrecurring Expense, Planned Permaent Facility Closure |  |  |  |  |  |  |  |  | $ 14,700 | $ 1,700 |  |  |  |  |
Restructuring and Related Cost, Accelerated Depreciation |  |  |  |  |  |  |  |  | $ 3,700 | 1,300 |  |  |  |  |
treasury stock retired, shares | 7,821,005 |  |  |  |  |  |  |  | 7,821,005 |  |  | 7,821,005 |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |
Number of shares repurchased (in shares) |  |  |  |  |  |  |  |  | 1,440,696 |  | 1,881,921 | 84,750 |  |  |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) |  |  |  |  |  |  |  |  | $ 57.53 |  | $ 53.13 |  |  |  |
Consumer Products |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 209,100 |  |  |  |  |  |  |  | $ 209,100 |  |  | $ 209,100 |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 941,907 | $ 988,380 | $ 959,894 |  |  |  |
Kroger Company | Consumer Products | Sales Revenue, Net [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total revenue from single customer |  |  |  |  |  |  |  |  | 15.30% | 13.40% | 12.30% |  |  |  |
Cellu Tissue Holdings Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 229,500
Manchester Industries [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | $ 35,100 |  |
Land Improvements | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
Land Improvements | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  | 40 years |  |  |  |  |  |
Building and Building Improvements | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
Building and Building Improvements | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  | 40 years |  |  |  |  |  |
Machinery and Equipment | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Machinery and Equipment | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  | 25 years |  |  |  |  |  |
Office And Other Equipment | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |
Office And Other Equipment | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |

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