Business Combinations Business Combinations Purchase Price Allocation (Details) (USD $)	6 Months Ended
	Jun. 30, 2012 years	May 01, 2012
Schedule of Assets and Liabilities Acquired in a Business Combination [Line Items]
Current assets		$ 13,928,000	[1]
Property, plant and equipment		1,653,000
Intangible assets subject to amortization		24,000,000
Total identified intangible assets		43,400,000
Goodwill		42,620,000
Current liabilities		(22,593,000)
Long-term liabilities		(263,000)
Total net assets acquired		78,745,000
Fair value of accounts receivable acquired		7,600,000
Gross contractual value of accounts receivable acquired		7,600,000
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life	8
Core Developed Technology [Member]
Schedule of Assets and Liabilities Acquired in a Business Combination [Line Items]
Intangible assets subject to amortization		15,100,000
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life	7
Customer Contracts And Relationships [Member]
Schedule of Assets and Liabilities Acquired in a Business Combination [Line Items]
Intangible assets subject to amortization		8,900,000
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life	11
In Process Research and Development [Member]
Schedule of Assets and Liabilities Acquired in a Business Combination [Line Items]
Intangible assets not subject to amortization		$ 19,400,000

[1] Current assets include the fair value of accounts receivable of $7.6 million, which equals its contractual balance as it is considered fully collectible.