Stock-Based Compensation (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Stock-Based Compensation Expense
Stock-based employee compensation expense	$ 7,684,000	$ 27,189,000	$ 15,312,000	$ 32,206,000
Tax effect on stock-based compensation expense	(2,981,000)	(11,116,000)	(5,908,000)	(13,162,000)
Total unrecognized compensation cost	57,300,000		57,300,000
Weighted average period for recognition of compensation cost			2 years 7 months 6 days
Segment Continuing Operations [Member]
Stock-Based Compensation Expense
Effect on net income, net of tax	4,703,000	16,073,000	9,404,000	19,044,000
Cost Of Sales [Member]
Stock-Based Compensation Expense
Stock-based employee compensation expense	1,188,000	3,036,000	2,405,000	3,906,000
Cost Of Recurring Revenues [Member]
Stock-Based Compensation Expense
Stock-based employee compensation expense	834,000	1,306,000	1,676,000	1,794,000
Cost Of Non Recurring Revenues [Member]
Stock-Based Compensation Expense
Stock-based employee compensation expense	354,000	1,730,000	729,000	2,112,000
Operating Expense [Member]
Stock-Based Compensation Expense
Stock-based employee compensation expense	6,496,000	24,153,000	12,907,000	28,300,000
Selling And Marketing Expense [Member]
Stock-Based Compensation Expense
Stock-based employee compensation expense	2,661,000	6,523,000	5,296,000	8,046,000
Research And Development Expense [Member]
Stock-Based Compensation Expense
Stock-based employee compensation expense	1,923,000	3,532,000	3,848,000	4,858,000
General And Administrative Expense [Member]
Stock-Based Compensation Expense
Stock-based employee compensation expense	$ 1,912,000	$ 14,098,000	$ 3,763,000	$ 15,396,000