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Stock Options And Employee Stock Purchase Plan (Allocation Of Share-Based Compensation Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Allocated Share-based Compensation Expense	$ 2,348	$ 2,293
Cost Of Revenues [Member]
Allocated Share-based Compensation Expense	214	242
Sales And Marketing [Member]
Allocated Share-based Compensation Expense	418	375
Research, Development And Engineering [Member]
Allocated Share-based Compensation Expense	106	116
General And Administrative [Member]
Allocated Share-based Compensation Expense	$ 1,610	$ 1,560

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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