Nature of Business and Summary of Significant Accounting Policies (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Customers Geographic_Regions Businesses_Acquired	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Number of Businesses Acquired	0		0
Number of customers worldwide	6,000
Number of geographic regions	3
Payment terms (in months)	12 months
Vesting period (in years)	3 years
Restructuring charges	$ 1,922	$ 20,931	$ 6,865
Stock options outstanding	284	546	1,296	2,375
Stock options exercise price lower range limit (price per share)	$ 10.33
Stock options exercise price upper range limit (price per share)	$ 27.50
Cumulative undistributed earnings of foreign subsidiaries	$ 19,800
Customer Lists [Member]
Finite-lived intangible assets, useful life, minimum (in years)	4
Finite-lived intangible assets, useful life, maximum (in years)	13
Acquired Software Technology [Member]
Finite-lived intangible assets, useful life, minimum (in years)	7
Finite-lived intangible assets, useful life, maximum (in years)	15
Trademarks [Member]
Useful Life (in years)	5
Computers, internal use software, furniture & fixtures and automobiles [Member]
Property, plant and equipment, useful life, minimum (in years)	2
Property, plant and equipment, useful life, maximum (in years)	7
Building and Building Improvements [Member]
Property, plant and equipment, useful life, minimum (in years)	15
Property, plant and equipment, useful life, maximum (in years)	40
Minimum [Member]
Subscription revenue period (in months)	36 months
Maximum [Member]
Subscription revenue period (in months)	60 months