Summary Of Operations And Significant Accounting Policies (Long-Lived Assets By Geographic Region) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total long-lived assets	$ 72,592	$ 72,422
United States
Segment Reporting Information [Line Items]
Total long-lived assets	35,445	35,711
Israel
Segment Reporting Information [Line Items]
Total long-lived assets	24,213	23,750
Australia
Segment Reporting Information [Line Items]
Total long-lived assets	10,437	10,361
United Kingdom
Segment Reporting Information [Line Items]
Total long-lived assets	$ 2,497	$ 2,600