Summary Of Significant Accounting Policies (Revenue Recognition) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Deferred Revenue Arrangement [Line Items]
Net out-of-period impact	$ 15,265	$ 14,440
NET REVENUE	48,207	44,480
Cost of goods sold	$ 32,942	$ 30,040
Minimum [Member]
Deferred Revenue Arrangement [Line Items]
Product maintenance contract term	12 months
Maximum [Member]
Deferred Revenue Arrangement [Line Items]
Product maintenance contract term	36 months
Net Revenue Derived From Services [Member]
Deferred Revenue Arrangement [Line Items]
Maximum percentage of total revenue	10.00%	10.00%