Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 54,196	$ 29,334
Accounts receivable, trade, less allowance of $9,169 and $8,686, respectively	460,518	341,104
Other receivables	24,449	23,491
Inventories and supplies	11,140	12,062
Prepaid taxes, licenses and permits	17,549	17,231
Other current assets	63,361	33,694
Total current assets	631,213	456,916
Property and equipment, at cost:
Land	77,172	72,103
Buildings and improvements	287,331	253,708
Revenue equipment	1,910,874	1,798,511
Service equipment and other	282,448	281,013
Total property and equipment	2,557,825	2,405,335
Less – accumulated depreciation	944,582	862,077
Property and equipment, net	1,613,243	1,543,258
Goodwill	74,618	0
Intangible assets, net	55,315	0
Other non-current assets	229,324	156,502
Total assets	2,603,713	2,156,676
Current liabilities:
Accounts payable	93,987	83,263
Current portion of long-term debt	5,000	25,000
Insurance and claims accruals	72,594	76,917
Accrued payroll	44,333	35,594
Accrued expenses	28,758	25,032
Other current liabilities	24,011	28,208
Total current liabilities	268,683	274,014
Long-term debt, net of current portion	422,500	175,000
Other long-term liabilities	43,314	43,114
Insurance and claims accruals, net of current portion	237,220	231,638
Deferred income taxes	268,499	237,870
Total liabilities	1,240,216	961,636
Commitments and contingencies
Temporary equity - redeemable noncontrolling interest	35,947	0
Stockholders’ equity:
Common stock, $0.01 par value, 200,000,000 shares authorized; 80,533,536 shares issued; 65,790,112 and 67,931,726 shares outstanding, respectively	805	805
Paid-in capital	121,904	116,039
Retained earnings	1,667,104	1,438,916
Accumulated other comprehensive loss	(20,604)	(22,833)
Treasury stock, at cost; 14,743,424 and 12,601,810 shares, respectively	(441,659)	(337,887)
Total stockholders’ equity	1,327,550	1,195,040
Total liabilities, temporary equity and stockholders’ equity	$ 2,603,713	$ 2,156,676