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Business Segments (Schedule Of Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]    
Total assets $ 864,312 $ 842,684
Goodwill 263,415 263,470
Hub [Member]
   
Segment Reporting Information [Line Items]    
Total assets 713,216 684,609
Goodwill 234,026 234,081
Mode [Member]
   
Segment Reporting Information [Line Items]    
Total assets 155,188 162,972
Goodwill 29,389 29,389
Inter-Segment Elims [Member]
   
Segment Reporting Information [Line Items]    
Total assets $ (4,092) $ (4,897)