Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 23,678	$ 15,428
Accounts receivable, trade, less allowance of $9,939 and $10,528, respectively	231,647	211,133
Other receivables	10,769	8,004
Inventories and supplies	15,743	23,260
Prepaid taxes, licenses and permits	15,064	14,893
Current deferred income taxes	25,315	25,139
Other current assets	27,445	21,330
Total current assets	349,661	319,187
Property and equipment, at cost:
Land	31,445	31,620
Buildings and improvements	132,023	132,201
Revenue equipment	1,364,064	1,335,897
Service equipment and other	200,205	190,772
Total property and equipment	1,727,737	1,690,490
Less – accumulated depreciation	750,219	696,647
Property and equipment, net	977,518	993,843
Other non-current assets	26,918	21,870
Total assets	1,354,097	1,334,900
Current liabilities:
Accounts payable	66,678	56,397
Current portion of long-term debt	0	20,000
Insurance and claims accruals	59,811	57,679
Accrued payroll	22,785	21,134
Other current liabilities	18,457	20,983
Total current liabilities	167,731	176,193
Long-term debt, net of current portion	40,000	70,000
Other long-term liabilities	14,710	15,779
Insurance and claims accruals, net of current portion	131,900	125,500
Deferred income taxes	227,237	232,531
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.01 par value, 200,000,000 shares authorized; 80,533,536 shares issued; 72,713,920 and 73,246,598 shares outstanding, respectively	805	805
Paid-in capital	98,534	97,457
Retained earnings	830,842	758,617
Accumulated other comprehensive loss	(4,631)	(4,156)
Treasury stock, at cost; 7,819,616 and 7,286,938 shares, respectively	(153,031)	(137,826)
Total stockholders’ equity	772,519	714,897
Total liabilities and stockholders’ equity	$ 1,354,097	$ 1,334,900