Summary Of Significant Accounting Policies (Revenue Recognition) (Details) (USD $)					3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2013 Minimum [Member]	Mar. 31, 2013 Maximum [Member]	Mar. 31, 2013 Net Revenue Derived From Services [Member]	Mar. 31, 2012 Net Revenue Derived From Services [Member]	Mar. 31, 2012 Revenue Recognition, Software [Member]
Deferred Revenue Arrangement [Line Items]
Noninterest-bearing Deposit Liabilities, Foreign	$ 2,700,000
Overstatement of revenue									600,000
Overstatement of costs									400,000
Product maintenance contract term					12 months	36 months
Maximum percentage of total revenue							10.00%	10.00%
Cash and cash equivalents	$ 40,297,000	$ 40,315,000	$ 41,447,000	$ 46,168,000