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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, 2013 | Dec. 31, 2011 | Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 73,730 |  | $ 73,730
Accumulated Amortization | (29,137) |  | (26,141)
Net Carrying Amount | 44,593 |  | 47,589
Customer relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 51,755 |  | 51,755
Accumulated Amortization | (22,039) |  | (19,585)
Net Carrying Amount | 29,716 |  | 32,170
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 | (2,888) |  | (2,567)
Net Carrying Amount | 12,512 |  | 12,833
Useful Lives (in years) | 24 years | 24 years |
Software [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 4,300 |  | 4,300
Accumulated Amortization | (1,935) |  | (1,720)
Net Carrying Amount | 2,365 |  | 2,580
Useful Lives (in years) | 10 years | 10 years |
Technology [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 1,725 |  | 1,725
Accumulated Amortization | (1,725) |  | (1,719)
Net Carrying Amount | 0 |  | 6
Useful Lives (in years) | 3 years | 3 years |
Favorable leases [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 |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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