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Goodwill and Identified Intangible Assets Goodwill and Intangible Assets - Estimated Future Amortized Intangible Expense by Purchased Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Acquired Indefinite-lived Intangible Assets [Line Items]    
2018 $ 8,379  
2019 8,379  
2020 4,014  
2021 507  
Total future amortization expense 21,279 $ 29,231
Operating expense [Member]    
Acquired Indefinite-lived Intangible Assets [Line Items]    
2018 3,199  
2019 3,199  
2020 3,063  
2021 507  
Total future amortization expense 9,968  
Cost of Sales [Member]    
Acquired Indefinite-lived Intangible Assets [Line Items]    
2018 5,180  
2019 5,180  
2020 951  
2021 0  
Total future amortization expense $ 11,311