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Fair Value Measurements - Investments (Details) (USD $) In Thousands, unless otherwise specified |  |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 27, 2014 | Dec. 31, 2013 | Sep. 28, 2013 | Sep. 27, 2014 Cost Basis Level 2 | Dec. 31, 2013 Cost Basis Level 2 | Sep. 28, 2013 Cost Basis Level 2 | Sep. 27, 2014 Estimated Fair Value Level 2 | Dec. 31, 2013 Estimated Fair Value Level 2 | Sep. 28, 2013 Estimated Fair Value Level 2 | Dec. 31, 2013 Jefferson County Alabama Sewer Revenue Refunding Warrants Auction rate security | Sep. 28, 2013 Jefferson County Alabama Sewer Revenue Refunding Warrants Auction rate security Level 3 | Dec. 31, 2008 Jefferson County Alabama Sewer Revenue Refunding Warrants Auction rate security Level 3 | Dec. 31, 2008 Jefferson County Alabama Sewer Revenue Refunding Warrants AAA rating Auction rate security Level 3
Fair value on a recurring basis |  |  |  |  |  |  |  |  |  |  |  |  |
Sale value of investment |  |  |  |  |  |  |  |  |  | $ 10,840 |  |  |
Purchase cost of investment |  |  |  |  |  |  |  |  |  |  |  |  | 13,550
Other-than-temporary pre-tax impairment on investment |  |  |  |  |  |  |  |  |  |  |  | 5,140 |
Carrying value of investment |  |  |  |  |  |  |  |  |  |  | 10,162 |  | 8,410
Unrealized loss in other comprehensive earnings |  |  |  |  |  |  |  |  |  |  | 677 |  |
Industrial revenue development bonds, carrying amount, approximates fair value | $ 7,500 | $ 7,500 | $ 7,500 | $ 7,500 | $ 7,500 | $ 7,500 | $ 7,500 | $ 7,500 | $ 7,500 |  |  |  |

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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition The noncurrent portion of the carrying value as of the balance sheet date of a type of municipal bond typically used to fund a development project. Also called special assessment limited liability bond, special district bond, special purpose bond, special tax bond and community development obligation. Interest owed to lenders is paid by taxes levied on the community benefiting from the particular bond-funded project. For example, if a bond of this sort was issued to pay for sidewalks to be repaved in a certain community, an additional tax would be levied on homeowners in the area benefiting from this project. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 20 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 22 + Details
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