Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net revenues	$ 420,080	$ 334,214	$ 1,194,820	$ 1,059,684
United States [Member]
Net revenues	408,120	324,519	1,165,223	1,019,328
Canada [Member]
Net revenues	6,193	3,261	12,259	16,522
United Kingdom [Member]
Net revenues	3,622	4,318	10,454	16,455
Other European [Member]
Net revenues	$ 2,145	$ 2,116	$ 6,884	$ 7,379