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Schedule II - Valuation And Qualifying Accounts (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Mode [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Allowance increase $ 4,400,000    
Allowance For Uncollectible Trade Accounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 3,879,000 4,607,000 5,102,000
Charged to Costs & Expenses 5,314,000 [1] 207,000 1,169,000
Charged to Other Accounts (1,294,000) [2] (625,000) [2] (1,652,000) [2]
Deductions (169,000) [3] (310,000) [3] (12,000) [3]
Balance At End of Year 7,730,000 3,879,000 4,607,000
Deferred Tax Valuation Allowance [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 379,000 379,000 163,000
Charged to Costs & Expenses (271,000)    216,000
Balance At End of Year $ 108,000 $ 379,000 $ 379,000
[1] Includes an increase in the allowance due to the Mode Transportation, LLC business acquisition of $4.4 million.
[2] Expected customer account adjustments charged to revenue and write-offs, net of recoveries
[3] Represents bad debt recoveries.