Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010	Dec. 31, 2009
Summary Of Significant Accounting Policies [Line Items]
Standard product warranty period	1
Deposit with financial institutions maturities period, months	3
Deposits with foreign banks	$ 37,531	$ 34,763
Shelf life of service inventory, months	12
Depreciation	$ 5,394	$ 4,842	$ 4,143
Valuation allowance, net deferred tax assets criterion, years	2
Likelihood that a tax benefit will be sustained	50.00%
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Extended product warranty period	1
Trade receivables time period due	30
Shelf life of demonstration inventory, months	6
Other intangible assets useful life	3
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Extended product warranty period	3
Trade receivables time period due	90
Shelf life of demonstration inventory, months	12
Real property lease term, years	7
Other intangible assets useful life	20