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Property and Equipment Property and Equipment Narrative (Details)
$ in Thousands
1 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
ft²
Jul. 04, 2015
USD ($)
Jun. 28, 2014
USD ($)
Jan. 03, 2015
USD ($)
Property, Plant and Equipment [Line Items]        
Property, Plant and Equipment, Number of Square Feet Purchased | ft² 90,000      
Property, Plant and Equipment, Additions $ 8,500      
Depreciation   $ 8,000 $ 6,200  
Depreciation and amortization   7,697 $ 6,113  
Property, plant and equipment, gross   182,153   $ 159,036
Accumulated depreciation   59,430   57,084
Construction-in-progress        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, gross   29,843   25,731
Furniture and office equipment        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, gross   7,155   4,864
Capital Leased Assets, Gross   600   600
Capital Lease Obligations [Member]        
Property, Plant and Equipment [Line Items]        
Accumulated depreciation   500   $ 400
Irvine, California | Construction-in-progress        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, gross   27,200    
Accounts Payable | Irvine, California | Construction-in-progress        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, gross   $ 6,200