Business Acquisitions (Schedule Of Useful Lives For Amortizable Intangible Assets) (Details) (Headstrong Corporation [Member], USD $) In Thousands, unless otherwise specified | 0 Months Ended |
|---|---|
May 03, 2011 | |
Customer-Related Intangible Assets [Member] | |
| Business Acquisition [Line Items] | |
| Intangible assets estimated useful lives, minimum, in years | 2 |
| Intangible assets estimated useful lives, maximum, in years | 11 |
| Intangible assets preliminary estimated value | $ 68,450 |
Marketing-Related Intangible Assets [Member] | |
| Business Acquisition [Line Items] | |
| Intangible assets estimated useful lives, in years | 10 |
| Intangible assets preliminary estimated value | 21,820 |
Other Intangibles [Member] | |
| Business Acquisition [Line Items] | |
| Intangible assets estimated useful lives, in years | 7 |
| Intangible assets preliminary estimated value | $ 750 |