Consolidated Condensed Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 1,156	$ 434
Receivables:
Trade, net	65,285	70,597
Other	4,719	10,885
Prepaid expenses and other	16,829	18,134
Total current assets	87,989	100,050
Property and equipment:
Revenue equipment, buildings and land, office equipment and other	723,457	724,597
Accumulated depreciation	(204,410)	(196,588)
Net property and equipment	519,047	528,009
Other assets	3,356	3,469
Total assets	610,392	631,528
Current liabilities:
Accounts payable and accrued liabilities	44,431	33,641
Insurance and claims accruals	17,105	16,235
Total current liabilities	$ 61,536	49,876
Long-term debt		37,867
Deferred income taxes	$ 138,044	134,364
Total liabilities	$ 199,580	$ 222,107
Stockholders’ equity:
Preferred stock, $.01 par value per share; 2,000,000 shares authorized; no shares issued and outstanding
Common stock, $.01 par value per share; 96,000,000 shares authorized; 32,419,481 shares at March 31, 2016, and 32,759,806 shares at December 31, 2015, issued and outstanding	$ 324	$ 328
Additional paid-in capital	70,481	76,468
Retained earnings	340,007	332,625
Total stockholders’ equity	410,812	409,421
Total liabilities and stockholders’ equity	$ 610,392	$ 631,528