Intangible Assets, Net and Goodwill (Schedule of Identifiable Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Summary of Identifiable Intangible Assets [Line Items]
Gross carrying amount	$ 37,198	$ 37,198
Accumulated amortization	(23,064)	(19,181)
Net carrying amount	14,134	18,017
Intangible assets not subject to amortization	115,421	115,421
Intangible assets, net	129,555	133,438
Patents And Purchased Technology [Member]
Summary of Identifiable Intangible Assets [Line Items]
Gross carrying amount	14,198	14,198
Accumulated amortization	(10,651)	(9,321)
Customer Relationships [Member]
Summary of Identifiable Intangible Assets [Line Items]
Gross carrying amount	23,000	23,000
Accumulated amortization	$ (12,413)	$ (9,860)