Summary Of Significant Accounting Policies (Schedule Of Useful Lives Of Finite Lived Intangible Assets) (Details)	12 Months Ended
	Dec. 31, 2011 years
Acquired Methodologies/Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets useful life, minimum (in years)	3
Definite-lived intangible assets useful life, maximum (in years)	10
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets useful life, minimum (in years)	3
Definite-lived intangible assets useful life, maximum (in years)	12
Panel [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets useful life (in years)	7
Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets useful life, minimum (in years)	7
Definite-lived intangible assets useful life, maximum (in years)	13
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets useful life, minimum (in years)	2
Definite-lived intangible assets useful life, maximum (in years)	10