Acquisitions (Identifiable Intangible Assets Acquired) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Zenprise
Business Acquisition [Line Items]
Finite-lived Intangible assets acquired	$ 69,200
Zenprise | Trade names
Business Acquisition [Line Items]
Finite-lived Intangible assets acquired	2,400
Finite-lived intangible assets acquired, Asset Life	3 years
Zenprise | Non-compete agreements
Business Acquisition [Line Items]
Finite-lived Intangible assets acquired	700
Finite-lived intangible assets acquired, Asset Life	1 year
Zenprise | Customer relationships
Business Acquisition [Line Items]
Finite-lived Intangible assets acquired	18,300
Finite-lived intangible assets acquired, Asset Life	7 years
Zenprise | Core and product technologies
Business Acquisition [Line Items]
Finite-lived Intangible assets acquired	47,800
Finite-lived intangible assets acquired, Asset Life	6 years
Zenprise | In-process R&D
Business Acquisition [Line Items]
Indefinite-lived intangible assets acquired	0	[1]
2013 Other Acquisitions
Business Acquisition [Line Items]
Finite-lived Intangible assets acquired	11,300
2013 Other Acquisitions | Trade names
Business Acquisition [Line Items]
Finite-lived Intangible assets acquired	0
2013 Other Acquisitions | Non-compete agreements
Business Acquisition [Line Items]
Finite-lived Intangible assets acquired	0
2013 Other Acquisitions | Customer relationships
Business Acquisition [Line Items]
Finite-lived Intangible assets acquired	3,600
Finite-lived intangible assets acquired, Asset Life	6 years
2013 Other Acquisitions | Core and product technologies
Business Acquisition [Line Items]
Finite-lived Intangible assets acquired	6,300
Finite-lived intangible assets acquired, Asset Life	5 years
2013 Other Acquisitions | In-process R&D
Business Acquisition [Line Items]
Indefinite-lived intangible assets acquired	1,400	[1]
ByteMobile
Business Acquisition [Line Items]
Finite-lived Intangible assets acquired	248,900
ByteMobile | Trade names
Business Acquisition [Line Items]
Finite-lived Intangible assets acquired	6,000
Finite-lived intangible assets acquired, Asset Life	6 years
ByteMobile | Customer relationships
Business Acquisition [Line Items]
Finite-lived Intangible assets acquired	141,500
Finite-lived intangible assets acquired, Asset Life	9 years
ByteMobile | Core and product technologies
Business Acquisition [Line Items]
Finite-lived Intangible assets acquired	$ 101,400
Finite-lived intangible assets acquired, Asset Life	4 years 9 months 18 days

[1] Capitalized acquired in-process R&D costs will remain capitalized until such time as the projects are complete, at which point they will be amortized, or they will be written off when it is probable the projects will not be completed.