Summary Of Significant Accounting Policies (Schedule Of Estimated Useful Lives Of Intangible Assets) (Details) | 9 Months Ended |
|---|---|
Sep. 30, 2011 | |
Customer-Related Intangible Assets [Member] | |
| Acquired Finite-Lived Intangible Assets [Line Items] | |
| Intangible assets estimated useful lives, minimum, in years | 2 |
| Intangible assets estimated useful lives, maximum, in years | 14 |
Marketing-Related Intangible Assets [Member] | |
| Acquired Finite-Lived Intangible Assets [Line Items] | |
| Intangible assets estimated useful lives, minimum, in years | 1 |
| Intangible assets estimated useful lives, maximum, in years | 10 |
Contract-Related Intangible Assets [Member] | |
| Acquired Finite-Lived Intangible Assets [Line Items] | |
| Intangible assets estimated useful lives, in years | 1 |
Other Intangible Assets [Member] | |
| Acquired Finite-Lived Intangible Assets [Line Items] | |
| Intangible assets estimated useful lives, minimum, in years | 3 |
| Intangible assets estimated useful lives, maximum, in years | 9 |