Consolidated Condensed Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019		Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 85,526		$ 56,763
Receivables:
Trade, net	84,443		83,033
Other	5,273		3,808
Prepaid expenses and other	18,025		19,924
Total current assets	193,267		163,528
Property and equipment:
Revenue equipment, buildings and land, office equipment and other	819,809		816,430
Accumulated depreciation	(241,658)		(228,200)
Net property and equipment	578,151		588,230
Other noncurrent assets	3,109	[1]	2,146
Total assets	774,527		753,904
Current liabilities:
Accounts payable	18,512		15,704
Insurance and claims accruals	29,381		28,103
Accrued and other current liabilities	31,649		28,166
Total current liabilities	79,542		71,973
Deferred income taxes	106,796		105,977
Noncurrent operating lease liabilities	452
Total liabilities	186,790		177,950
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; 54,572,289 shares at March 31, 2019, and 54,466,691 shares at December 31, 2018, issued and outstanding	546		545
Additional paid-in capital	76,687		76,814
Retained earnings	510,504		498,595
Total stockholders’ equity	587,737		575,954
Total liabilities and stockholders’ equity	$ 774,527		$ 753,904

[1] Operating lease assets balance at January 1, 2019.