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Business Segments (Schedule Of Assets) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Total assets | $ 842,684 | $ 629,407 |
Goodwill | 263,470 | 233,029 | 232,892
Hub [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 684,609 | 629,407 |
Goodwill | 234,081 | 233,029 |
Mode [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 162,972 |  |
Goodwill | 29,389 |  |
Inter-Segment Elims [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | $ (4,897) |  |

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