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Financial Instruments Measured at Fair Value - AFS (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
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Jun. 28, 2014 | Dec. 31, 2013
Marubun [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available For Sale Investment Ownership Percentage | 8.40% |
Cost basis | $ 10,016 | $ 10,016
Unrealized holding gain | 4,311 | 2,709
Fair value | 14,327 | 12,725
WPG [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available For Sale Investment Ownership Percentage | 1.90% |
Cost basis | 10,798 | 10,798
Unrealized holding gain | 31,710 | 24,903
Fair value | 42,508 | 35,701
Mutual Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost basis | 15,735 | 15,614
Unrealized holding gain | 6,732 | 5,817
Fair value | $ 22,467 | $ 21,431

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- Definition Available For Sale Investment Ownership Percentage. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + 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 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of unrealized gain (loss) on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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