Acquisitions (Narrative) (Details) - Aug. 01, 2015 - Series of Individually Immaterial Business Acquisitions [Member] - USD ($)	Total	Total
Business Acquisition [Line Items]
Purchase Consideration Transferred	$ 96,100,000
Payments to Acquire Businesses, Gross	95,600,000
Cash Acquired from Acquisition	100,000
Other Consideration Transferred	500,000
Direct Business Acquisition Transaction Costs	1,500,000	$ 1,500,000
Integration Related Costs	800,000	1,700,000
Goodwill, Expected Tax Deductible Amount	38,100,000	38,100,000
Step Acquisition, Equity Interest in Acquiree, Fair Value		$ 400,000
Step Acquisition, Equity Interest in Acquiree, Valuation Techniques		The Company used a market approach based on comparable recent investments into this acquired business to estimate the acquisition-date fair value of the existing equity interest.
Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain (Loss), Net		$ 0
Provisional Information, Initial Accounting Incomplete, Items		identifiable intangible assets and deferred tax liabilities
Provisional Information, Initial Accounting Incomplete, Reasons		Additional information that existed as of the acquisition date may become known to the Company during the remainder of the acquisitions’ measurement periods.
RSU Grant
Business Acquisition [Line Items]
Separately Recognized Transaction, Aggregate Fair Value	$ 6,400,000
Separately Recognized Transaction, Tranche Vesting Period	6 months
Separately Recognized Transaction, Total Vesting Period	2 years
Separately Recognized Transaction, Description		For certain employees, the Company granted RSUs with an aggregate fair value of $6.4 million at the grant date, with RSUs vesting approximately every six months for a total vesting period of approximately two years.
Separately Recognized Transactions, Accounting Method	The RSUs will be accounted for as stock-based compensation expense
Separately Recognized Transaction, Financial Statement Caption	“Cost of revenues,” “Research and development,” “Sales and marketing,” and “General and administrative”
Separately Recognized Transaction, Expense Recognized	$ 900,000	$ 1,100,000
Cash Retention Award
Business Acquisition [Line Items]
Separately Recognized Transaction, Aggregate Fair Value	$ 10,300,000
Separately Recognized Transaction, Total Vesting Period	4 years
Separately Recognized Transaction, Description		For certain other employees, the Company will pay a total aggregate amount of $10.3 million as cash awards for their services. The cash awards are paid out in annual installments over a total period of four years.
Separately Recognized Transactions, Accounting Method		The cash awards will be accounted for as employees’ compensation expense
Separately Recognized Transaction, Financial Statement Caption		“Research and development”
Separately Recognized Transaction, Expense Recognized	$ 1,600,000	$ 2,000,000
Acquisition-related Costs
Business Acquisition [Line Items]
Acquisition Cost Expensed, Financial Statement Caption		Acquisition and integration costs