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Property And Equipment (Components Of Property And Equipment) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Property And Equipment [Abstract]    
Building and improvements $ 72 $ 72
Leasehold improvements 2,515 2,222
Computer equipment and software 59,292 53,317
Furniture and equipment 8,534 8,141
Transportation equipment 136,691 54,316
Construction in process 1,101  
Property and Equipment, gross 208,205 118,068
Less: Accumulated depreciation and amortization (83,618) (70,262)
Property and Equipment, net $ 124,587 $ 47,806