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Basis of Presentation and Significant Accounting Policies (Property and Equipment) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2017
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Dec. 31, 2016
Property, Plant and Equipment [Line Items]            
Proceeds from sale of building       $ 7,895 $ 0  
Asset historical cost   $ 43,236   43,236   $ 49,481
Accumulated depreciation   129,206   129,206   $ 134,786
Gain on sale of building   $ 4,624 $ 0 $ 4,624 $ 0  
Equipment | Minimum            
Property, Plant and Equipment [Line Items]            
Property, plant and equipment, useful life       3 years    
Equipment | Maximum            
Property, Plant and Equipment [Line Items]            
Property, plant and equipment, useful life       5 years    
Tools, Dies and Molds | Minimum            
Property, Plant and Equipment [Line Items]            
Property, plant and equipment, useful life       1 year    
Tools, Dies and Molds | Maximum            
Property, Plant and Equipment [Line Items]            
Property, plant and equipment, useful life       3 years    
Software Development | Minimum            
Property, Plant and Equipment [Line Items]            
Property, plant and equipment, useful life       3 years    
Software Development | Maximum            
Property, Plant and Equipment [Line Items]            
Property, plant and equipment, useful life       5 years    
Building            
Property, Plant and Equipment [Line Items]            
Property, plant and equipment, useful life       30 years    
Shanghai, China | Building            
Property, Plant and Equipment [Line Items]            
Proceeds from sale of building $ 7,900          
Asset historical cost 3,600          
Accumulated depreciation 1,400          
Direct selling costs 1,100          
Gain on sale of building $ (4,600)