Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 29,334	$ 26,418
Accounts receivable, trade, less allowance of $8,686 and $7,921, respectively	341,104	322,846
Other receivables	23,491	52,221
Inventories and supplies	12,062	9,243
Prepaid taxes, licenses and permits	17,231	16,757
Other current assets	33,694	38,849
Total current assets	456,916	466,334
Property and equipment, at cost:
Land	72,103	63,244
Buildings and improvements	253,708	199,734
Revenue equipment	1,798,511	1,812,186
Service equipment and other	281,013	268,372
Total property and equipment	2,405,335	2,343,536
Less – accumulated depreciation	862,077	817,260
Property and equipment, net	1,543,258	1,526,276
Other non-current assets	156,502	151,254
Total assets	2,156,676	2,143,864
Current liabilities:
Accounts payable	83,263	94,634
Current portion of long-term debt	25,000	75,000
Insurance and claims accruals	76,917	69,810
Accrued payroll	35,594	38,347
Accrued expenses	25,032	11,072
Other current liabilities	28,208	19,977
Total current liabilities	274,014	308,840
Long-term debt, net of current portion	175,000	225,000
Other long-term liabilities	43,114	21,129
Insurance and claims accruals, net of current portion	231,638	228,218
Deferred income taxes	237,870	249,669
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.01 par value, 200,000,000 shares authorized; 80,533,536 shares issued; 67,931,726 and 69,244,525 shares outstanding, respectively	805	805
Paid-in capital	116,039	112,649
Retained earnings	1,438,916	1,294,608
Accumulated other comprehensive loss	$ (22,833)	$ (14,728)
Treasury stock, shares	12,601,810	11,289,011
Treasury stock, at cost; 12,601,810 and 11,289,011 shares, respectively	$ (337,887)	$ (282,326)
Total stockholders’ equity	1,195,040	1,111,008
Total liabilities and stockholders’ equity	$ 2,156,676	$ 2,143,864