Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 31,833	$ 22,604
Accounts receivable, trade, less allowance of $10,298 and $10,017, respectively	251,023	266,727
Other receivables	17,241	20,316
Inventories and supplies	16,415	17,824
Prepaid taxes, licenses and permits	15,657	14,914
Current deferred income taxes	28,037	34,066
Income taxes receivable	20,052	23,435
Other current assets	27,281	26,458
Total current assets	407,539	426,344
Property and equipment, at cost:
Land	34,356	32,213
Buildings and improvements	134,595	130,618
Revenue equipment	1,530,617	1,413,178
Service equipment and other	209,032	210,220
Total property and equipment	1,908,600	1,786,229
Less – accumulated depreciation	754,130	772,447
Property and equipment, net	1,154,470	1,013,782
Other non-current assets	51,675	40,336
Total assets	1,613,684	1,480,462
Current liabilities:
Accounts payable	70,643	64,827
Insurance and claims accruals	64,106	73,814
Accrued payroll	25,233	28,121
Other current liabilities	23,720	19,768
Total current liabilities	183,702	186,530
Long-term debt, net of current portion	75,000	75,000
Other long-term liabilities	19,832	20,021
Insurance and claims accruals, net of current portion	125,195	123,445
Deferred income taxes	$ 274,301	$ 241,606
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.01 par value, 200,000,000 shares authorized; 80,533,536 shares issued; 71,998,750 and 72,038,368 shares outstanding, respectively	$ 805	$ 805
Paid-in capital	102,734	101,803
Retained earnings	1,022,966	915,085
Accumulated other comprehensive loss	(13,063)	(9,375)
Treasury stock, at cost; 8,534,786 and 8,495,168 shares, respectively	(177,788)	(174,458)
Total stockholders’ equity	935,654	833,860
Total liabilities and stockholders’ equity	$ 1,613,684	$ 1,480,462