Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 15,428	$ 12,412
Accounts receivable, trade, less allowance of $10,528 and $10,154, respectively	211,133	218,712
Other receivables	8,004	9,213
Inventories and supplies	23,260	30,212
Prepaid taxes, licenses and permits	14,893	15,094
Current deferred income taxes	25,139	25,805
Other current assets	21,330	29,883
Total current assets	319,187	341,331
Propert and equipment, at cost:
Land	31,620	30,242
Buildings and improvements	132,201	130,230
Revenue equipment	1,335,897	1,284,060
Service equipment and other	190,772	180,476
Total property and equipment	1,690,490	1,625,008
Less – accumulated depreciation	696,647	682,872
Property and equipment, net	993,843	942,136
Other non-current assets	21,870	18,949
Total assets	1,334,900	1,302,416
Current liabilities:
Checks issued in excess of cash balances	0	6,671
Accounts payable	56,397	93,486
Current portion of long-term debt	20,000	0
Insurance and claims accruals	57,679	62,681
Accrued payroll	21,134	19,483
Other current liabilities	20,983	16,504
Total current liabilities	176,193	198,825
Long-term debt, net of current portion	70,000	0
Other long-term liabilities	15,779	14,194
Insurance and claims accruals, net of current portion	125,500	121,250
Deferred income taxes	232,531	243,000
Commitments and contingencies
Stockholders' equity:
Common stock, $0.01 par value, 200,000,000 shares authorized; 80,533,536 shares issued; 73,246,598 and 72,847,576 shares outstanding, respectively	805	805
Paid-in capital	97,457	94,396
Retained earnings	758,617	779,994
Accumulated other comprehensive loss	(4,156)	(5,170)
Treasury stock, at cost; 7,286,938 and 7,685,960 shares, respectively	(137,826)	(144,878)
Total stockholders' equity	714,897	725,147
Total liabilities and stockholders' equity	$ 1,334,900	$ 1,302,416