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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Current assets:    
Cash and cash equivalents $ 15,356 $ 7,750
Accounts receivable, net of allowance of $1,456 in 2017 and $1,345 in 2016 104,153 96,636
Drivers' advances and other receivables, net of allowance of $556 in 2017 and $519 in 2016 15,062 8,757
Inventory and supplies 4,232 3,980
Prepaid expenses 8,699 10,889
Assets held for sale 1,444 2,695
Income taxes receivable 11,551 4,256
Other short-term assets 1,817
Total current assets 162,314 134,963
Property and equipment, at cost 650,988 631,076
Less: accumulated depreciation and amortization (186,916) (165,605)
Net property and equipment 464,072 465,471
Other assets, net 23,282 20,104
Total assets 649,668 620,538
Current liabilities:    
Checks outstanding in excess of bank balances 189
Accounts payable 11,857 13,032
Accrued expenses 26,520 26,607
Current maturities of long-term debt 24,596 24,947
Current portion of capital lease obligations 2,962 2,441
Current portion of insurance and claims accrual 15,042 17,177
Other short-term liabilities 243 3,388
Total current liabilities 81,220 87,781
Long-term debt 164,465 168,676
Capital Leases, Capital lease obligations, long-term 21,777 19,761
Insurance and claims accrual 21,836 20,866
Deferred income taxes 63,344 84,157
Other long-term liabilities 1,825 2,883
Total liabilities 354,467 384,124
Commitments and contingent liabilities
Stockholders' equity:    
Additional paid-in-capital 137,242 137,912
Treasury stock at cost; no shares as of December 31, 2017 and 23,656 shares as of December 31, 2016 (1,084)
Accumulated other comprehensive income (loss) 293 (2,640)
Retained earnings 157,471 102,032
Total stockholders' equity 295,201 236,414
Total liabilities and stockholders' equity 649,668 620,538
Common Class A [Member]    
Stockholders' equity:    
Common stock 171 170
Common Class B [Member]    
Stockholders' equity:    
Common stock $ 24 $ 24