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Condensed Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 122,146 $ 15,356
Accounts receivable, net of allowance of $1,538 in 2018 and $1,460 in 2017 103,053 104,153
Drivers' advances and other receivables, net of allowance of $628 in 2018 and $496 in 2017 12,804 15,062
Inventory and supplies 4,313 4,232
Prepaid expenses 13,268 8,699
Assets held for sale 3,225 1,444
Income taxes receivable 5,099 11,551
Other short-term assets 2,165 1,817
Total current assets 266,073 162,314
Property and equipment, at cost 614,381 650,988
Less: accumulated depreciation and amortization (177,803) (186,916)
Net property and equipment 436,578 464,072
Other assets, net 27,175 23,282
Total assets 729,826 649,668
Current liabilities:    
Accounts payable 12,295 11,857
Accrued expenses 29,420 26,520
Current maturities of long-term debt 32,450 24,596
Current portion of capital lease obligations 4,863 2,962
Current portion of insurance and claims accrual 14,594 15,042
Other short-term liabilities 243
Total current liabilities 93,622 81,220
Long-term debt 196,038 164,465
Long-term portion of capital lease obligations 35,160 21,777
Insurance and claims accrual 19,492 21,836
Deferred income taxes 70,552 63,344
Other long-term liabilities 1,411 1,825
Total liabilities 416,275 354,467
Commitments and contingent liabilities
Stockholders' equity:    
Additional paid-in-capital 139,362 137,242
Accumulated other comprehensive income 1,544 293
Retained earnings 172,450 157,471
Total stockholders' equity 313,551 295,201
Total liabilities and stockholders' equity 729,826 649,668
Common Class A [Member]    
Stockholders' equity:    
Common stock 171 171
Common Class B [Member]    
Stockholders' equity:    
Common stock $ 24 $ 24