Summary Of Operations And Significant Accounting Policies (Long-Lived Assets by Geographic Region) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Total long-lived assets	$ 72,422	$ 44,042
United States [Member]
Segment Reporting Information [Line Items]
Total long-lived assets	35,711	28,626
Israel [Member]
Segment Reporting Information [Line Items]
Total long-lived assets	23,750	13,167
Australia [Member]
Segment Reporting Information [Line Items]
Total long-lived assets	10,361
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total long-lived assets	$ 2,600	$ 2,249