Business Combinations (Allocation of Total Purchase Considerations) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Apr. 24, 2015	Nov. 17, 2014	Oct. 20, 2014	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill	$ 65,705				$ 16,290	$ 1,491
iSocket
Business Acquisition [Line Items]
Shares of the Company's common stock			$ 11,200
Estimated fair value of contingent consideration			9,100
Fair value of stock-based awards exchanged			2,142
Total purchase consideration			22,407
Cash acquired			600
Intangible assets			12,193
Goodwill			9,461
Net assets acquired			22,407
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Cash and Other Assets			1,521
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities, Other			$ (768)
Shiny
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross				$ 4,651
Estimated fair value of contingent consideration				700
Cash acquired				100
Intangible assets				2,300
Goodwill				3,021
Net assets acquired				4,651
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Cash and Other Assets				737
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities, Other				$ (1,407)
Chango
Business Acquisition [Line Items]
Shares of the Company's common stock		$ 72,477
Estimated fair value of contingent consideration		16,171
Fair value of stock-based awards exchanged	$ 4,058	4,318
Cash paid		9,097
Working capital adjustment		(184)
Total purchase consideration		101,619
Cash acquired		450
Accounts receivable		13,333
Prepaid and other assets		1,025
Fixed assets		265
Intangible assets		52,420
Goodwill		51,732
Total assets acquired		119,225
Accounts payable and accrued expenses		5,825
Other liabilities		443
Deferred tax liability, net		11,338
Total liabilities assumed		17,606
Net assets acquired		101,619
In-process research and development | Chango
Business Acquisition [Line Items]
Intangible assets		$ 580