Income Taxes (Domestic And Foreign Components Of Income Before Provision For Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Contingency [Line Items]
United States									$ 6,252	$ 16,495	$ 12,478
Income before provision for income taxes	2,661	2,630	191	5,235	5,959	4,344	3,598	5,249	10,717	19,150	14,333
Israel [Member]
Income Tax Contingency [Line Items]
Foreign									2,819	1,837	1,572
United Kingdom [Member]
Income Tax Contingency [Line Items]
Foreign									1,449	818	283
Australia [Member]
Income Tax Contingency [Line Items]
Foreign									$ 197