Consolidated Condensed Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 35,739	$ 15,791
Receivables:
Trade, net	84,055	74,886
Other	6,993	6,131
Prepaid expenses and other	18,816	19,810
Total current assets	145,603	116,618
Property and equipment:
Revenue equipment, buildings and land, office equipment and other	820,523	783,648
Accumulated depreciation	(223,087)	(211,728)
Net property and equipment	597,436	571,920
Other assets	2,281	1,865
Total assets	745,320	690,403
Current liabilities:
Accounts payable and accrued liabilities	48,259	38,100
Insurance and claims accruals	25,295	26,177
Total current liabilities	73,554	64,277
Deferred income taxes	107,696	100,626
Total liabilities	181,250	164,903
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; 192,000,000 shares authorized; 54,662,924 shares at September 30, 2018, and 54,533,455 shares at December 31, 2017, issued and outstanding	547	545
Additional paid-in capital	79,304	76,413
Retained earnings	484,219	448,542
Total stockholders’ equity	564,070	525,500
Total liabilities and stockholders’ equity	$ 745,320	$ 690,403