Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 13,626	$ 16,962
Accounts receivable, trade, less allowance of $8,250 and $9,183, respectively	304,174	261,372
Other receivables	26,491	15,168
Inventories and supplies	11,694	12,768
Prepaid taxes, licenses and permits	15,972	15,374
Income taxes receivable	1,189	21,497
Other current assets	27,083	29,987
Total current assets	400,229	373,128
Property and equipment, at cost:
Land	56,300	56,261
Buildings and improvements	171,619	148,443
Revenue equipment	1,630,344	1,676,070
Service equipment and other	256,074	229,217
Total property and equipment	2,114,337	2,109,991
Less – accumulated depreciation	767,474	747,353
Property and equipment, net	1,346,863	1,362,638
Other non-current assets	60,899	57,237
Total assets	1,807,991	1,793,003
Current liabilities:
Checks issued in excess of cash balances	21,539	0
Accounts payable	73,802	66,618
Current portion of long-term debt	0	20,000
Insurance and claims accruals	79,674	83,404
Accrued payroll	32,520	26,189
Other current liabilities	24,642	18,650
Total current liabilities	232,177	214,861
Long-term debt, net of current portion	75,000	160,000
Other long-term liabilities	12,575	16,711
Insurance and claims accruals, net of current portion	108,270	113,875
Deferred income taxes	195,187	292,769
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.01 per value, 200,000,000 shares authorized; 80,533,536 shares issued;72,409,222 and 72,166,969 shares outstanding, respectively	805	805
Paid-in capital	102,563	101,035
Retained earnings	1,267,871	1,084,796
Accumulated other comprehensive loss	(15,835)	(16,917)
Treasury stock, at cost; 8,124,314 and 8,366,567 shares, respectively	(170,622)	(174,932)
Total stockholders’ equity	1,184,782	994,787
Total liabilities and stockholders’ equity	$ 1,807,991	$ 1,793,003