Goodwill And Acquisition-Related Intangibles, Net (Narrative) (Details)	12 Months Ended	35 Months Ended	69 Months Ended
Mar. 31, 2013 Minimum [Member]	Mar. 31, 2013 Maximum [Member]	Feb. 29, 2016 Weighted Average [Member]	Dec. 31, 2017 Weighted Average [Member]
Goodwill [Line Items]
Estimated useful lives of acquisition-related intangible assets	2 years	14 years
Weighted-average remaining useful life for acquired-related intangible assets			3 years 11 months	5 years 8 months

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275

Name:	us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration