Business Combinations (Acquisition Of Nimbus Partners Limited) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			0 Months Ended
	Nov. 30, 2011 Customer Base [Member] years	Nov. 30, 2011 Maintenance Agreements [Member] years	Nov. 30, 2011 Trademarks [Member] years	Aug. 30, 2011 Nimbus Partners Limited [Member] years	Aug. 30, 2011 Nimbus Partners Limited [Member] Existing Technology [Member] years	Aug. 30, 2011 Nimbus Partners Limited [Member] Subscriber Base [Member] years	Aug. 30, 2011 Nimbus Partners Limited [Member] Customer Base [Member] years	Aug. 30, 2011 Nimbus Partners Limited [Member] Maintenance Agreements [Member] years	Aug. 30, 2011 Nimbus Partners Limited [Member] Trademarks [Member] years
Business Acquisition [Line Items]
Cash				$ 971
Accounts receivable (approximate contractual value)				3,634
Other assets				763
Intangible assets subject to amortization				19,800	13,900	1,200	700	3,100	900
Goodwill				27,117
Liabilities				(6,693)
Deferred income tax liabilities, net				(3,592)
Business acquisition, cash paid				42,000
Gross Amount at Acquisition Date				$ 19,800	$ 13,900	$ 1,200	$ 700	$ 3,100	$ 900
Weighted Average Amortization Period (in years)	3.7	3.8	4.1	5.3	5.0	5.0	5.0	7.0	5.0