Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 Y	Dec. 31, 2011
Goodwill And Other Intangible Assets [Line Items]
Gross Carrying Amounts	$ 447,854	$ 366,626
Accumulated Amortization	(74,442)	(67,166)
Net Carrying Amount	373,412	299,460
Customer And Vendor Agreements [Member]
Goodwill And Other Intangible Assets [Line Items]
Useful Lives (Years), Minimum	5
Useful Lives (Years), Maximum	20
Gross Carrying Amounts	399,167	336,839
Accumulated Amortization	(67,998)	(61,110)
Net Carrying Amount	331,169	275,729
Trade Names And Trademarks-Other [Member]
Goodwill And Other Intangible Assets [Line Items]
Useful Lives (Years), Minimum	3
Useful Lives (Years), Maximum	15
Gross Carrying Amounts	3,160	3,160
Accumulated Amortization	(1,255)	(1,200)
Net Carrying Amount	1,905	1,960
Software [Member]
Goodwill And Other Intangible Assets [Line Items]
Useful Lives (Years), Minimum	3
Useful Lives (Years), Maximum	10
Gross Carrying Amounts	5,530	5,530
Accumulated Amortization	(3,620)	(3,383)
Net Carrying Amount	1,910	2,147
Non-Compete Agreements [Member]
Goodwill And Other Intangible Assets [Line Items]
Useful Lives (Years), Minimum	2
Useful Lives (Years), Maximum	5
Gross Carrying Amounts	2,471	2,471
Accumulated Amortization	(1,569)	(1,473)
Net Carrying Amount	902	998
Trade Names And Trademarks-Indefinite Lived [Member]
Goodwill And Other Intangible Assets [Line Items]
Gross Carrying Amounts	37,526	18,626
Accumulated Amortization
Indefinite Lived, Net Carrying Amount	$ 37,526	$ 18,626