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Restructuring - Severance and Retention Costs by Classification on the Income Statement (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Restructuring Cost and Reserve [Line Items]    
Total expense $ 1,130us-gaap_SeveranceCosts1 $ 1,900us-gaap_SeveranceCosts1
Severance charges included in cost of revenue    
Restructuring Cost and Reserve [Line Items]    
Total expense 530us-gaap_SeveranceCosts1
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
1,682us-gaap_SeveranceCosts1
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
Severance charges included in selling, general and administrative    
Restructuring Cost and Reserve [Line Items]    
Total expense $ 600us-gaap_SeveranceCosts1
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
$ 218us-gaap_SeveranceCosts1
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember