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Restructuring (Components of Restructuring Expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Restructuring Cost and Reserve [Line Items]        
Total restructuring expense $ 0 $ 67 $ 0 $ 2,605
2016 Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Total restructuring expense     0 4,355
2016 Restructuring Plan | Cost of revenue — restructuring:        
Restructuring Cost and Reserve [Line Items]        
Tooling and inventory write offs     0 1,679
Employee severance and benefits     0 71
Total restructuring expense     0 1,750
2016 Restructuring Plan | Operating expenses — restructuring:        
Restructuring Cost and Reserve [Line Items]        
Employee severance and benefits     0 2,510
Licensed technology and other assets write offs     0 65
Other     0 30
Total restructuring expense     $ 0 $ 2,605