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Commitments and Contingencies Warranty Liabilities (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Apr. 04, 2015 | Mar. 29, 2014
Warranty Liabilities [Roll Forward] |  |
Balance at beginning of year | $ 5,824 us-gaap_StandardProductWarrantyAccrual | $ 4,153 us-gaap_StandardProductWarrantyAccrual
Additions charged to costs and expenses for current-year sales | 3,008 us-gaap_StandardProductWarrantyAccrualWarrantiesIssued | 1,568 us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
Deductions from reserves | (2,318)us-gaap_StandardProductWarrantyAccrualPayments | (1,536)us-gaap_StandardProductWarrantyAccrualPayments
Changes in liability for pre-existing warranties during the current year, including expirations | 211 us-gaap_StandardProductWarrantyAccrualPreexistingIncreaseDecrease | 153 us-gaap_StandardProductWarrantyAccrualPreexistingIncreaseDecrease
Balance at end of period | $ 6,725 us-gaap_StandardProductWarrantyAccrual | $ 4,338 us-gaap_StandardProductWarrantyAccrual

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- Definition Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(1),(c)(5) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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- Definition Represents the aggregate decrease in the liability for payments made (in cash or in kind) to satisfy claims under the terms of the standard product warranty. Does not include any Increase or Decrease in the liability for payments related to extended product warranties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(2)) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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- Definition Represents the aggregate Increase or Decrease in the liability during the reporting period for accruals related to preexisting standard product warranties (including adjustments related to changes in estimates). Does not include any Increase or Decrease in the liability for accruals related to extended product warranties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(4)) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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- Definition Represents the aggregate increase in the liability for accruals related to standard product warranties issued during the reporting period. Does not include any increase in the liability for accruals related to extended product warranties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(3)) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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