Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Total net revenues	$ 1,973,446	[1]	$ 1,594,113	[1]	$ 1,393,068	[1]
United States [Member]
Total net revenues	1,927,344		1,571,051		1,361,899
United Kingdom [Member]
Total net revenues	34,350		13,779		21,873
Other European [Member]
Total net revenues	$ 11,752		$ 9,283		$ 9,296

[1] No individual client accounted for more than 10 percent of total net revenues for the years ended December 31, 2013, 2012, or 2011.