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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 25, 2010 | Dec. 26, 2009
Allowance for Doubtful Accounts [Member] |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Balance | $ 5,447 |  | $ 5,947 |  | $ 6,690 |
Charged to costs and expenses | (229) |  | 4,763 |  | 506 |
Other additions | (2) | [1] | 111 | [1] | 85 | [1]
Deductions | 3,652 |  | 5,374 |  | 1,334 |
Balance | 1,564 |  | 5,447 |  | 5,947 |
Environmental Reserves [Member] |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Balance | 23,902 |  | 23,268 |  | 23,248 |
Charged to costs and expenses | 392 |  | 5,378 |  | 1,087 |
Other additions | 0 |  | (6) |  | 5 |
Deductions | 1,402 |  | 4,738 |  | 1,072 |
Balance | 22,892 |  | 23,902 |  | 23,268 |
Valuation Allowance of Deferred Tax Assets [Member] |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Balance | 28,714 |  | 33,812 |  | 32,624 |
Charged to costs and expenses | (443) |  | (5,496) |  | 52 |
Other additions | 1,434 | [2] | 398 |  | 1,136 | [2]
Deductions | 0 |  | 0 |  | 0 |
Balance | $ 29,705 |  | $ 28,714 |  | $ 33,812 |
[1] | Other consists primarily of bad debt recoveries as well as the effect of fluctuating foreign currency exchange rates in all years presented.
[2] | Other includes the additions to valuation allowances in which previously unrecorded gross deferred tax assets and valuation allowances were recognized.

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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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