Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 33,930	$ 13,626
Accounts receivable, trade, less allowance of $8,613 and $8,250, respectively	337,927	304,174
Other receivables	26,545	26,491
Inventories and supplies	10,060	11,694
Prepaid taxes, licenses and permits	16,619	15,972
Other current assets	31,577	28,272
Total current assets	456,658	400,229
Property and equipment, at cost:
Land	59,103	56,300
Buildings and improvements	188,174	171,619
Revenue equipment	1,750,290	1,630,344
Service equipment and other	250,010	256,074
Total property and equipment	2,247,577	2,114,337
Less – accumulated depreciation	760,015	767,474
Property and equipment, net	1,487,562	1,346,863
Other non-current assets	139,284	60,899
Total assets	2,083,504	1,807,991
Current liabilities:
Checks issued in excess of cash balances	0	21,539
Accounts payable	97,781	73,802
Current portion of long-term debt	75,000	0
Insurance and claims accruals	67,304	79,674
Accrued payroll	40,271	32,520
Other current liabilities	30,004	24,642
Total current liabilities	310,360	232,177
Long-term debt, net of current portion	50,000	75,000
Other long-term liabilities	10,911	12,575
Insurance and claims accruals, net of current portion	214,030	108,270
Deferred income taxes	233,450	195,187
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.01 per value, 200,000,000 shares authorized; 80,533,536 shares issued; 70,441,973 and 72,409,222 shares outstanding, respectively	805	805
Paid-in capital	107,455	102,563
Retained earnings	1,413,746	1,267,871
Accumulated other comprehensive loss	(16,073)	(15,835)
Treasury stock, at cost; 10,091,563 and 8,124,314 shares, respectively	(241,180)	(170,622)
Total stockholders’ equity	1,264,753	1,184,782
Total liabilities and stockholders’ equity	$ 2,083,504	$ 1,807,991