Summary Of Significant Accounting Policies (Revenue Recognition) (Details) (USD $)	3 Months Ended		9 Months Ended					9 Months Ended				3 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2013 Foreign Subsidiaries [Member]	Sep. 30, 2013 Minimum [Member]	Sep. 30, 2013 Maximum [Member]	Sep. 30, 2013 Net Revenue Derived From Services [Member]	Sep. 30, 2012 Net Revenue Derived From Services [Member]	Dec. 31, 2012 Prior Period Adjustment, Revenue Recognition Methodology [Member]	Dec. 31, 2011 Prior Period Adjustment, Revenue Recognition Methodology [Member]
Deferred Revenue Arrangement [Line Items]
Overstatement of revenue													$ 2,800,000
Overstatement of costs													1,900,000
Net out-of-period impact	16,873,000	12,268,000	48,320,000	40,494,000								1,100,000
Revenues	52,603,000	48,223,000	147,766,000	150,529,000								4,200,000
Cost of goods sold	35,730,000	35,955,000	99,446,000	110,035,000								3,100,000
Product maintenance contract term								12 months	36 months
Maximum percentage of total revenue										10.00%	10.00%
Cash and cash equivalents	$ 40,357,000	$ 40,542,000	$ 40,357,000	$ 40,542,000	$ 40,315,000	$ 46,168,000	$ 2,900,000