Goodwill and Other Intangible Assets (Schedule Of Components Of Other Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 73,730	$ 73,730
Accumulated Amortization	(23,077)	(19,981)
Net Carrying Amount	50,653	53,749
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	51,755	51,755
Accumulated Amortization	(17,130)	(14,676)
Net Carrying Amount	34,625	37,079
Useful Lives (in years)	11 years	11 years
Trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	15,400	15,400
Accumulated Amortization	(2,246)	(1,925)
Net Carrying Amount	13,154	13,475
Useful Lives (in years)	24 years	24 years
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 years	2 years
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,300	4,300
Accumulated Amortization	(1,505)	(1,290)
Net Carrying Amount	2,795	3,010
Useful Lives (in years)	10 years	10 years
Off-Market Favorable Lease [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,725	1,725
Accumulated Amortization	(1,646)	(1,540)
Net Carrying Amount	$ 79	$ 185
Useful Lives (in years)	3 years	3 years