Business Combinations (Streambase Acquisition Intangible Assets) (Details) (StreamBase Systems, USD $) In Thousands, unless otherwise specified	0 Months Ended
	Jun. 03, 2013
Business Acquisition [Line Items]
Gross Amount at Acquisition Date	$ 19,600
Weighted Average Amortization Period
Existing Technology
Business Acquisition [Line Items]
Gross Amount at Acquisition Date	12,300
Weighted Average Amortization Period	7 years
Customer base
Business Acquisition [Line Items]
Gross Amount at Acquisition Date	3,700
Weighted Average Amortization Period	7 years
Maintenance agreements
Business Acquisition [Line Items]
Gross Amount at Acquisition Date	$ 3,600
Weighted Average Amortization Period	7 years