Acquisitions (Allocation of Total Purchase Prices) (Details) (USD $) In Thousands, unless otherwise specified					1 Months Ended			1 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Zenprise	Jan. 31, 2013 Zenprise Minimum	Jan. 31, 2013 Zenprise Maximum	Dec. 31, 2013 2013 Other Acquisitions	Jan. 31, 2013 2013 Other Acquisitions Minimum	Jan. 31, 2013 2013 Other Acquisitions Maximum	Dec. 31, 2013 ByteMobile	Dec. 31, 2013 ByteMobile Minimum	Dec. 31, 2013 ByteMobile Maximum
Purchase Price Allocation
Current assets				$ 10,943			$ 3,586			$ 57,796
Other assets				668			0			7,406
Property and equipment				431			0			2,484
Deferred tax assets, non-current				38,785			3,177			44,934
Intangible assets				69,200			11,300			248,900
Goodwill	1,768,949	1,518,219	1,239,120	247,273			4,195			221,914
Assets acquired				367,300			22,258			583,434
Current liabilities assumed				(8,475)			(3,950)			(62,313)
Deferred tax liabilities, current				0			(2,000)
Long-term liabilities assumed				(3,107)			(1,000)			(4,083)
Deferred tax liabilities, non-current				(28,725)			(1,699)			(111,904)
Net assets acquired				$ 326,993			$ 13,609			$ 405,134
Finite-lived intangible assets acquired, Asset Life					1 year	7 years		5 years	6 years		1 year	9 years