Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010
Goodwill And Other Intangible Assets [Line Items]
Gross Carrying Amounts	$ 366,626	$ 241,437
Accumulated Amortization	(67,166)	(47,576)
Net Carrying Amount	299,460	193,861
Customer And Vendor Agreements [Member]
Goodwill And Other Intangible Assets [Line Items]
Weighted Average Useful Lives (in Years), Minimum	5
Weighted Average Useful Lives (in Years), Maximum	20
Gross Carrying Amounts	336,839	218,250
Accumulated Amortization	(61,110)	(43,184)
Net Carrying Amount	275,729	175,066
Trade Names And Trademarks-Other [Member]
Goodwill And Other Intangible Assets [Line Items]
Weighted Average Useful Lives (in Years), Minimum	3
Weighted Average Useful Lives (in Years), Maximum	15
Gross Carrying Amounts	3,160	3,160
Accumulated Amortization	(1,200)	(980)
Net Carrying Amount	1,960	2,180
Software [Member]
Goodwill And Other Intangible Assets [Line Items]
Weighted Average Useful Lives (in Years), Minimum	3
Weighted Average Useful Lives (in Years), Maximum	10
Gross Carrying Amounts	5,530	5,530
Accumulated Amortization	(3,383)	(2,283)
Net Carrying Amount	2,147	3,247
Non Compete Agreements [Member]
Goodwill And Other Intangible Assets [Line Items]
Weighted Average Useful Lives (in Years), Minimum	2
Weighted Average Useful Lives (in Years), Maximum	5
Gross Carrying Amounts	2,471	1,871
Accumulated Amortization	(1,473)	(1,129)
Net Carrying Amount	998	742
Trade Names And Trademarks-Indefinite [Member]
Goodwill And Other Intangible Assets [Line Items]
Weighted Average Useful Lives (in Years), Maximum
Gross Carrying Amounts	18,626	12,626
Accumulated Amortization
Indefinite Lived, Net Carrying Amount	$ 18,626	$ 12,626