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Consolidated Statement of Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allocated Share-based Compensation Expense	$ 9,132	$ 8,993	$ 10,937
Cost Of Revenues [Member]
Allocated Share-based Compensation Expense	844	982	1,217
Sales And Marketing [Member]
Allocated Share-based Compensation Expense	1,543	1,431	1,826
Research, Development And Engineering [Member]
Allocated Share-based Compensation Expense	459	477	815
General And Administrative [Member]
Allocated Share-based Compensation Expense	$ 6,286	$ 6,103	$ 7,079

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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