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Note 2. Details of Consolidated Balance Sheet Accounts (Details) - Prepaid Expenses and Other (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Note 2. Details of Consolidated Balance Sheet Accounts (Details) - Prepaid Expenses and Other [Line Items]    
Insurance premiums $ 1,384 $ 1,316
Other 2,606 2,652
15,274 15,490
License Fees [Member]
    
Note 2. Details of Consolidated Balance Sheet Accounts (Details) - Prepaid Expenses and Other [Line Items]    
Prepaid Expenses 4,169 4,194
Tires In Service [Member]
    
Note 2. Details of Consolidated Balance Sheet Accounts (Details) - Prepaid Expenses and Other [Line Items]    
Prepaid Expenses 3,982 4,261
Parts And Tires Inventory [Member]
    
Note 2. Details of Consolidated Balance Sheet Accounts (Details) - Prepaid Expenses and Other [Line Items]    
Prepaid Expenses $ 3,133 $ 3,067