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Employee Retirement Plans - Summary of the Basis Used to Measure Pension Plans' Assets at Fair Value (Details) (USD $) In Thousands, unless otherwise specified | Dec. 29, 2012 | Dec. 31, 2011 | Dec. 31, 2010
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Elgin Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | $ 3,503 |  | $ 3,188 | $ 3,342
Smithville Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 8,781 |  | 7,820 | 8,253
Wrexham Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 12,997 |  | 11,518 | 0
Total [Member] | Elgin Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 3,503 |  |  |
Total [Member] | Smithville Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 8,781 |  |  |
Total [Member] | Wrexham Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 12,997 |  |  |
Total [Member] | Short Term Investment Fund [Member] | Elgin Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 205 | [1] |  |
Total [Member] | Short Term Investment Fund [Member] | Smithville Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 402 | [1] |  |
Total [Member] | Short Term Investment Fund [Member] | Wrexham Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 328 | [1] |  |
Total [Member] | Equity Securities [Member] | Elgin Plan [Member] | Large Cap [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 752 |  |  |
Total [Member] | Equity Securities [Member] | Elgin Plan [Member] | Mid Cap [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 86 |  |  |
Total [Member] | Equity Securities [Member] | Elgin Plan [Member] | Small Cap [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 84 |  |  |
Total [Member] | Equity Securities [Member] | Elgin Plan [Member] | International [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 778 |  |  |
Total [Member] | Equity Securities [Member] | Smithville Plan [Member] | Large Cap [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 1,920 |  |  |
Total [Member] | Equity Securities [Member] | Smithville Plan [Member] | Mid Cap [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 223 |  |  |
Total [Member] | Equity Securities [Member] | Smithville Plan [Member] | Small Cap [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 212 |  |  |
Total [Member] | Equity Securities [Member] | Smithville Plan [Member] | International [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 1,958 |  |  |
Total [Member] | Equity Securities [Member] | Wrexham Plan [Member] | International Developed Markets [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 3,663 |  |  |
Total [Member] | Equity Securities [Member] | Wrexham Plan [Member] | International Emerging Markets [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 548 |  |  |
Total [Member] | Equity Securities [Member] | Wrexham Plan [Member] | International Global Markets [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 636 |  |  |
Total [Member] | Equity Securities [Member] | Wrexham Plan [Member] | United Kingdom [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 4,430 |  |  |
Total [Member] | Fixed Income [Member] | Elgin Plan [Member] | Government/Corporate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 1,119 |  |  |
Total [Member] | Fixed Income [Member] | Elgin Plan [Member] | High Yield [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 141 |  |  |
Total [Member] | Fixed Income [Member] | Smithville Plan [Member] | Government/Corporate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 2,861 |  |  |
Total [Member] | Fixed Income [Member] | Smithville Plan [Member] | High Yield [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 353 |  |  |
Total [Member] | Fixed Income [Member] | Wrexham Plan [Member] | Government/Corporate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 1,965 |  |  |
Total [Member] | Fixed Income [Member] | Wrexham Plan [Member] | Aggregate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 373 |  |  |
Total [Member] | Fixed Income [Member] | Wrexham Plan [Member] | Index Linked [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 1,054 |  |  |
Total [Member] | Alternative [Member] | Elgin Plan [Member] | Global Real Estate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 139 |  |  |
Total [Member] | Alternative [Member] | Elgin Plan [Member] | Commodities Investment [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 199 |  |  |
Total [Member] | Alternative [Member] | Smithville Plan [Member] | Global Real Estate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 355 |  |  |
Total [Member] | Alternative [Member] | Smithville Plan [Member] | Commodities Investment [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 497 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Elgin Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 3,298 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Smithville Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 8,379 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Wrexham Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 12,669 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short Term Investment Fund [Member] | Elgin Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 | [1] |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short Term Investment Fund [Member] | Smithville Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 | [1] |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short Term Investment Fund [Member] | Wrexham Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 | [1] |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | Elgin Plan [Member] | Large Cap [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 752 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | Elgin Plan [Member] | Mid Cap [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 86 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | Elgin Plan [Member] | Small Cap [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 84 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | Elgin Plan [Member] | International [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 778 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | Smithville Plan [Member] | Large Cap [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 1,920 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | Smithville Plan [Member] | Mid Cap [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 223 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | Smithville Plan [Member] | Small Cap [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 212 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | Smithville Plan [Member] | International [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 1,958 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | Wrexham Plan [Member] | International Developed Markets [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 3,663 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | Wrexham Plan [Member] | International Emerging Markets [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 548 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | Wrexham Plan [Member] | International Global Markets [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 636 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | Wrexham Plan [Member] | United Kingdom [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 4,430 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income [Member] | Elgin Plan [Member] | Government/Corporate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 1,119 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income [Member] | Elgin Plan [Member] | High Yield [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 141 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income [Member] | Smithville Plan [Member] | Government/Corporate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 2,861 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income [Member] | Smithville Plan [Member] | High Yield [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 353 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income [Member] | Wrexham Plan [Member] | Government/Corporate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 1,965 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income [Member] | Wrexham Plan [Member] | Aggregate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 373 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income [Member] | Wrexham Plan [Member] | Index Linked [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 1,054 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Alternative [Member] | Elgin Plan [Member] | Global Real Estate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 139 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Alternative [Member] | Elgin Plan [Member] | Commodities Investment [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 199 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Alternative [Member] | Smithville Plan [Member] | Global Real Estate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 355 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Alternative [Member] | Smithville Plan [Member] | Commodities Investment [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 497 |  |  |
Significant Observable Inputs (Level 2) [Member] | Elgin Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 205 |  |  |
Significant Observable Inputs (Level 2) [Member] | Smithville Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 402 |  |  |
Significant Observable Inputs (Level 2) [Member] | Wrexham Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 328 |  |  |
Significant Observable Inputs (Level 2) [Member] | Short Term Investment Fund [Member] | Elgin Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 205 | [1] |  |
Significant Observable Inputs (Level 2) [Member] | Short Term Investment Fund [Member] | Smithville Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 402 | [1] |  |
Significant Observable Inputs (Level 2) [Member] | Short Term Investment Fund [Member] | Wrexham Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 328 | [1] |  |
Significant Observable Inputs (Level 2) [Member] | Equity Securities [Member] | Elgin Plan [Member] | Large Cap [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Observable Inputs (Level 2) [Member] | Equity Securities [Member] | Elgin Plan [Member] | Mid Cap [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Observable Inputs (Level 2) [Member] | Equity Securities [Member] | Elgin Plan [Member] | Small Cap [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Observable Inputs (Level 2) [Member] | Equity Securities [Member] | Elgin Plan [Member] | International [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Observable Inputs (Level 2) [Member] | Equity Securities [Member] | Smithville Plan [Member] | Large Cap [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Observable Inputs (Level 2) [Member] | Equity Securities [Member] | Smithville Plan [Member] | Mid Cap [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Observable Inputs (Level 2) [Member] | Equity Securities [Member] | Smithville Plan [Member] | Small Cap [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Observable Inputs (Level 2) [Member] | Equity Securities [Member] | Smithville Plan [Member] | International [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Observable Inputs (Level 2) [Member] | Equity Securities [Member] | Wrexham Plan [Member] | International Developed Markets [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Observable Inputs (Level 2) [Member] | Equity Securities [Member] | Wrexham Plan [Member] | International Emerging Markets [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Observable Inputs (Level 2) [Member] | Equity Securities [Member] | Wrexham Plan [Member] | International Global Markets [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Observable Inputs (Level 2) [Member] | Equity Securities [Member] | Wrexham Plan [Member] | United Kingdom [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Observable Inputs (Level 2) [Member] | Fixed Income [Member] | Elgin Plan [Member] | Government/Corporate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Observable Inputs (Level 2) [Member] | Fixed Income [Member] | Elgin Plan [Member] | High Yield [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Observable Inputs (Level 2) [Member] | Fixed Income [Member] | Smithville Plan [Member] | Government/Corporate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Observable Inputs (Level 2) [Member] | Fixed Income [Member] | Smithville Plan [Member] | High Yield [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Observable Inputs (Level 2) [Member] | Fixed Income [Member] | Wrexham Plan [Member] | Government/Corporate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Observable Inputs (Level 2) [Member] | Fixed Income [Member] | Wrexham Plan [Member] | Aggregate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Observable Inputs (Level 2) [Member] | Fixed Income [Member] | Wrexham Plan [Member] | Index Linked [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Observable Inputs (Level 2) [Member] | Alternative [Member] | Elgin Plan [Member] | Global Real Estate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Observable Inputs (Level 2) [Member] | Alternative [Member] | Elgin Plan [Member] | Commodities Investment [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Observable Inputs (Level 2) [Member] | Alternative [Member] | Smithville Plan [Member] | Global Real Estate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Observable Inputs (Level 2) [Member] | Alternative [Member] | Smithville Plan [Member] | Commodities Investment [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Elgin Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Smithville Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Wrexham Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Short Term Investment Fund [Member] | Elgin Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 | [1] |  |
Significant Unobservable Inputs (Level 3) [Member] | Short Term Investment Fund [Member] | Smithville Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 | [1] |  |
Significant Unobservable Inputs (Level 3) [Member] | Short Term Investment Fund [Member] | Wrexham Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 | [1] |  |
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member] | Elgin Plan [Member] | Large Cap [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member] | Elgin Plan [Member] | Mid Cap [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member] | Elgin Plan [Member] | Small Cap [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member] | Elgin Plan [Member] | International [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member] | Smithville Plan [Member] | Large Cap [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member] | Smithville Plan [Member] | Mid Cap [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member] | Smithville Plan [Member] | Small Cap [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member] | Smithville Plan [Member] | International [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member] | Wrexham Plan [Member] | International Developed Markets [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member] | Wrexham Plan [Member] | International Emerging Markets [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member] | Wrexham Plan [Member] | International Global Markets [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member] | Wrexham Plan [Member] | United Kingdom [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Fixed Income [Member] | Elgin Plan [Member] | Government/Corporate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Fixed Income [Member] | Elgin Plan [Member] | High Yield [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Fixed Income [Member] | Smithville Plan [Member] | Government/Corporate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Fixed Income [Member] | Smithville Plan [Member] | High Yield [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Fixed Income [Member] | Wrexham Plan [Member] | Government/Corporate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Fixed Income [Member] | Wrexham Plan [Member] | Aggregate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Fixed Income [Member] | Wrexham Plan [Member] | Index Linked [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Alternative [Member] | Elgin Plan [Member] | Global Real Estate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Alternative [Member] | Elgin Plan [Member] | Commodities Investment [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Alternative [Member] | Smithville Plan [Member] | Global Real Estate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 0 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Alternative [Member] | Smithville Plan [Member] | Commodities Investment [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | $ 0 |  |  |
[1] | Represents collective short term investment fund, composed of high-grade money market instruments with short maturities.

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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