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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 8,549 $ 6,846
Accounts receivable, net of allowance of $1,662 in 2013 and $1,729 in 2012 78,016 76,220
Drivers' advances and other receivables, net of allowance of $1,143 in 2013 and $1,041 in 2012 4,504 3,851
Inventory and supplies 4,514 4,550
Prepaid expenses 6,368 8,244
Assets held for sale 5,984 3,898
Deferred income taxes 6,228 4,642
Income taxes receivable   59
Total current assets 114,163 108,310
Property and equipment, at cost 411,347 419,947
Less: accumulated depreciation and amortization (140,403) (140,930)
Net property and equipment 270,944 279,017
Other assets, net 12,541 12,905
Total assets 397,648 400,232
Current liabilities:    
Checks outstanding in excess of bank balances 7,419 8,261
Accounts payable 9,606 10,035
Accrued expenses 27,265 27,884
Current maturities of long-term debt 56,798 63,636
Current portion of capital lease obligations 2,127 2,091
Current portion of insurance and claims accrual 17,276 16,383
Total current liabilities 120,491 128,290
Long-term debt 102,731 95,214
Long-term portion of capital lease obligations 13,458 14,003
Insurance and claims accrual 15,590 16,768
Deferred income taxes 51,248 49,837
Other long-term liabilities 1,417 1,447
Total liabilities 304,935 305,559
Commitments and contingent liabilities      
Stockholders' equity:    
Additional paid-in-capital 89,369 90,328
Treasury stock at cost; 973,657 shares and 1,059,643 shares as of March 31, 2013 and December 31, 2012, respectively (13,121) (13,955)
Accumulated other comprehensive income 443 320
Retained earnings 15,854 17,813
Total stockholders' equity 92,713 94,673
Total liabilities and stockholders' equity 397,648 400,232
Common Class A [Member]
    
Stockholders' equity:    
Common stock 144 143
Common Class B [Member]
    
Stockholders' equity:    
Common stock $ 24 $ 24