Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
CURRENT ASSETS
Cash and cash equivalents	$ 69,747	$ 33,232
Trade receivables, net	58,497	61,009
Prepaid tires	8,180	9,584
Other current assets	13,258	8,316
Income tax receivable	0	7,641
Deferred income taxes, net	0	16,662
Total current assets	149,682	136,444
PROPERTY AND EQUIPMENT
Land and land improvements	39,008	37,899
Buildings	47,837	47,837
Leasehold improvements	1,703	1,703
Furniture and fixtures	2,096	2,096
Shop and service equipment	10,739	10,917
Revenue equipment	564,255	571,281
Construction in progress	441	213
Property, Plant and Equipment, Gross	666,079	671,946
Less accumulated depreciation	219,382	197,948
Property and equipment, net	446,697	473,998
GOODWILL	100,212	100,212
OTHER INTANGIBLES, NET	13,532	14,013
DEFERRED INCOME TAXES, NET	5,206	0
OTHER ASSETS	11,457	11,363
Assets	726,786	736,030
CURRENT LIABILITIES
Accounts payable and accrued liabilities	6,367	7,516
Compensation and benefits	27,126	24,636
Insurance accruals	22,338	21,573
Income taxes payable	6,486	0
Other accruals	12,823	12,443
Total current liabilities	75,140	66,168
LONG-TERM LIABILITIES
Income taxes payable	14,631	16,228
Deferred income taxes, net	93,884	112,118
Insurance accruals less current portion	63,630	59,435
Other long-term liabilities	10,953	12,153
Total long-term liabilities	183,098	199,934
STOCKHOLDERS' EQUITY
Preferred stock, par value $.01; authorized 5,000 shares; none issued	0	0
Capital stock, common, $.01 par value; authorized 395,000 shares; issued 90,689 in 2016 and 2015; outstanding 83,234 and 84,115 in 2016 and 2015, respectively	907	907
Additional paid-in capital	4,023	4,126
Retained earnings	588,659	575,948
Treasury stock, at cost; 7,455 and 6,574 shares in 2016 and 2015 respectively	(125,041)	(111,053)
Stockholders' Equity Attributable to Parent	468,548	469,928
Liabilities and Stockholders' Equity	$ 726,786	$ 736,030