Goodwill And Intangible Assets (Intangible Assets Acquired Either Individually Or With A Group Of Other Assets Or In A Business Combination) (Details) (USD $) In Thousands | Sep. 30, 2011 | Dec. 31, 2010 |
|---|---|---|
| Acquired Finite-Lived Intangible Assets [Line Items] | ||
| Gross carrying amount | $ 328,226 | $ 239,861 |
| Accumulated amortization | 215,367 | 206,514 |
| Net | 112,859 | 33,347 |
Customer-Related Intangible Assets [Member] | ||
| Acquired Finite-Lived Intangible Assets [Line Items] | ||
| Gross carrying amount | 285,949 | 222,285 |
| Accumulated amortization | 197,156 | 188,989 |
| Net | 88,793 | 33,296 |
Marketing-Related Intangible Assets [Member] | ||
| Acquired Finite-Lived Intangible Assets [Line Items] | ||
| Gross carrying amount | 37,378 | 15,835 |
| Accumulated amortization | 16,426 | 15,835 |
| Net | 20,952 | |
Contract-Related Intangible Assets [Member] | ||
| Acquired Finite-Lived Intangible Assets [Line Items] | ||
| Gross carrying amount | 1,358 | 1,423 |
| Accumulated amortization | 1,358 | 1,423 |
| Net | ||
Other Intangible Assets [Member] | ||
| Acquired Finite-Lived Intangible Assets [Line Items] | ||
| Gross carrying amount | 3,541 | 318 |
| Accumulated amortization | 427 | 267 |
| Net | $ 3,114 | $ 51 |