Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net revenues	$ 1,612,650	$ 1,416,562	$ 1,382,026
United States [Member]
Net revenues	1,571,051	1,361,899	1,340,727
Canada [Member]
Net revenues	18,813	23,422	10,739
United Kingdom [Member]
Net revenues	13,503	21,945	20,479
Other European [Member]
Net revenues	$ 9,283	$ 9,296	$ 10,081