Acquisitions (Schedule Of Amortization Periods For Acquired Intangible Assets) (Details)	6 Months Ended
	Jun. 30, 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