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Acquisitions (Schedule Of Amortization Periods For Acquired Intangible Assets) (Details) | 3 Months Ended
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Mar. 31, 2013
Customer Relationships [Member] |
Acquired Finite-Lived Intangible Assets [Line Items] |
Identifiable Intangible Asset, Useful Life (Yrs) | 10 years
Noncompete Agreements [Member] |
Acquired Finite-Lived Intangible Assets [Line Items] |
Identifiable Intangible Asset, Useful Life (Yrs) | 2 years
Minimum [Member] | Proprietary Technology [Member] |
Acquired Finite-Lived Intangible Assets [Line Items] |
Identifiable Intangible Asset, Useful Life (Yrs) | 6 years
Maximum [Member] | Proprietary Technology [Member] |
Acquired Finite-Lived Intangible Assets [Line Items] |
Identifiable Intangible Asset, Useful Life (Yrs) | 10 years

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- Details
Name: | us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration