Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 7,252	$ 7,750
Accounts receivable, net of allowance of $1,488 in 2017 and $1,345 in 2016	73,500	96,636
Drivers' advances and other receivables, net of allowance of $547 in 2017 and $519 in 2016	11,371	8,757
Inventory and supplies	4,034	3,980
Prepaid expenses	8,135	10,889
Assets held for sale	2,597	2,695
Income taxes receivable	7,381	4,256
Other short-term assets, net	1,018
Total current assets	115,288	134,963
Property and equipment, at cost	641,284	631,076
Less: accumulated depreciation and amortization	(173,058)	(165,605)
Net property and equipment	468,226	465,471
Other long-term assets, net	25,915	20,104
Total assets	609,429	620,538
Current liabilities:
Checks outstanding in excess of bank balances	1,611	189
Accounts payable	9,042	13,032
Accrued expenses	21,893	26,607
Current maturities of long-term debt	22,678	24,947
Current portion of capital lease obligations	2,508	2,441
Current portion of insurance and claims accrual	16,561	17,177
Other short-term liabilities	4,450	3,388
Total current liabilities	78,743	87,781
Long-term debt	159,941	168,676
Long-term portion of capital lease obligations	20,056	19,761
Insurance and claims accrual	26,153	20,866
Deferred income taxes	86,023	84,157
Other long-term liabilities	3,165	2,883
Total liabilities	374,081	384,124
Commitments and contingent liabilities
Stockholders' equity:
Additional paid-in-capital	136,786	137,912
Treasury stock at cost; 325 and 23,656 shares as of March 31, 2017 and December 31, 2016, respectively	(6)	(1,084)
Accumulated other comprehensive loss	(3,619)	(2,640)
Retained earnings	101,993	102,032
Total stockholders' equity	235,348	236,414
Total liabilities and stockholders' equity	609,429	620,538
Common Class A [Member]
Stockholders' equity:
Common stock	170	170
Common Class B [Member]
Stockholders' equity:
Common stock	$ 24	$ 24