Summary Of Significant Accounting Policies (Revenue Recognition) (Details) (USD $)						6 Months Ended				3 Months Ended	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2013 Foreign Subsidiaries [Member]	Jun. 30, 2013 Minimum [Member]	Jun. 30, 2013 Maximum [Member]	Jun. 30, 2013 Net Revenue Derived From Services [Member]	Jun. 30, 2012 Net Revenue Derived From Services [Member]	Jun. 30, 2012 Revenue Recognition, Software [Member]	Jun. 30, 2012 Revenue Recognition, Software [Member]
Deferred Revenue Arrangement [Line Items]
Overstatement of revenue										$ 100,000	$ 2,200,000
Overstatement of costs										300,000	1,900,000
Product maintenance contract term						12 months	36 months
Maximum percentage of total revenue								10.00%	10.00%
Cash and cash equivalents	$ 40,402,000	$ 40,315,000	$ 40,499,000	$ 46,168,000	$ 3,100,000