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Restructuring (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2010	Dec. 31, 2011
Restructuring [Line Items]
Number positions eliminated		23
Vacated office space in square feet		3,700
Restructuring charges	$ 0.9
Selling, General And Administrative Expense [Member]
Restructuring [Line Items]
Restructuring charges	0.4
Research And Development Expense [Member]
Restructuring [Line Items]
Restructuring charges	0.5

Identification of the line item(s) in the statement of income that includes the costs of the restructuring and related activities.

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- Definition

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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