Business Combination (Acquisition Of Nimbus Partners Limited) (Details) (Nimbus Partners Limited [Member], USD $)	0 Months Ended
	Aug. 30, 2011
Business Acquisition [Line Items]
Cash paid to acquire outstanding equity shares	$ 42,000,000
Acquisition related and other expenses	1,000,000
Cash	971,000
Accounts receivable (approximate contractual value)	3,634,000
Other assets	763,000
Identifiable intangible assets	19,800,000
Goodwill	27,117,000
Liabilities	(6,693,000)
Deferred income tax liabilities, net	(3,592,000)
Total purchase price	42,000,000
Gross Amount at Acquisition Date	19,800,000
Weighted Average Amortization Period (in years)	5.3
Subscriber Base [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	1,200,000
Gross Amount at Acquisition Date	1,200,000
Weighted Average Amortization Period (in years)	5.0
Existing Technology [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	13,900,000
Gross Amount at Acquisition Date	13,900,000
Weighted Average Amortization Period (in years)	5.0
Customer Base [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	700,000
Gross Amount at Acquisition Date	700,000
Weighted Average Amortization Period (in years)	5.0
Trademarks [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	900,000
Gross Amount at Acquisition Date	900,000
Weighted Average Amortization Period (in years)	5.0
Maintenance Agreements [Member]
Business Acquisition [Line Items]
Identifiable intangible assets	3,100,000
Gross Amount at Acquisition Date	$ 3,100,000
Weighted Average Amortization Period (in years)	7.0