Goodwill And Other Intangible Assets (Schedule Of Components Of Other Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010 years
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 73,730	$ 73,730
Accumulated Amortization	(19,981)	(13,606)
Net Carrying Amount	53,749	60,124
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	51,755	51,755
Accumulated Amortization	(14,676)	(9,767)
Net Carrying Amount	37,079	41,988
Useful Lives (in years)	11	11
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	15,400	15,400
Accumulated Amortization	(1,925)	(1,283)
Net Carrying Amount	13,475	14,117
Useful Lives (in years)	24	24
Software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	550	550
Accumulated Amortization	(550)	(550)
Net Carrying Amount	0	0
Useful Lives (in years)	2	2
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,300	4,300
Accumulated Amortization	(1,290)	(860)
Net Carrying Amount	3,010	3,440
Useful Lives (in years)	10	10
Favorable Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,725	1,725
Accumulated Amortization	(1,540)	(1,146)
Net Carrying Amount	$ 185	$ 579
Useful Lives (in years)	3	3