Balance Sheet Account Detail (Goodwill and Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Goodwill, Finite-lived, and Indefinite-lived Intangible Assets [Line Items]
Goodwill	$ 120,927	$ 120,711
Intangible assets (excluding goodwill), net	80,403	84,511
Developed technology
Goodwill, Finite-lived, and Indefinite-lived Intangible Assets [Line Items]
Finite lived intangibles	67,600	67,600
Accumulated amortization	(7,167)	(3,810)
Finite lived intangibles, net	60,433	63,790
Customer relationship
Goodwill, Finite-lived, and Indefinite-lived Intangible Assets [Line Items]
Finite lived intangibles	7,500	7,500
Accumulated amortization	(1,438)	(687)
Finite lived intangibles, net	6,062	6,813
Trademarks and trade names
Goodwill, Finite-lived, and Indefinite-lived Intangible Assets [Line Items]
Indefinite lived intangibles	2,708	2,708
In-process research and development
Goodwill, Finite-lived, and Indefinite-lived Intangible Assets [Line Items]
Indefinite lived intangibles	$ 11,200	$ 11,200