Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
CURRENT ASSETS
Cash and cash equivalents	$ 159,170	$ 128,507
Trade receivables, net	46,221	46,844
Prepaid tires	10,379	8,181
Other current assets	21,867	13,841
Income tax receivable	0	4,738
Total current assets	237,637	202,111
PROPERTY AND EQUIPMENT
Land and land improvements	39,192	39,356
Buildings	48,372	48,371
Leasehold improvements	1,703	1,703
Furniture and fixtures	2,154	2,096
Shop and service equipment	11,089	11,009
Revenue equipment	537,947	556,464
Construction in progress	74	54
Property, Plant and Equipment, Gross	640,531	659,053
Less accumulated depreciation	252,038	251,405
Property and equipment, net	388,493	407,648
GOODWILL	100,212	100,212
OTHER INTANGIBLES, NET	11,609	12,090
Deferred Income Taxes, Net	1,568	3,785
OTHER ASSETS	12,190	12,382
Assets	751,709	738,228
CURRENT LIABILITIES
Accounts payable and accrued liabilities	16,228	12,355
Compensation and benefits	22,239	23,320
Insurance accruals	18,415	19,132
Income Taxes payable	3,281	0
Other accruals	13,286	10,727
Total current liabilities	73,449	65,534
LONG-TERM LIABILITIES
Income taxes payable	9,509	11,954
Deferred income taxes, net	92,493	94,657
Insurance accruals less current portion	58,013	60,257
Total long-term liabilities	160,015	166,868
COMMITMENTS AND CONTINGENCIES (Note 14)
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 2017 and 2016; outstanding 83,292 in 2017 and 83,287 in 2016, respectively	907	907
Additional paid-in capital	3,403	3,433
Retained earnings	638,037	625,668
Treasury stock, at cost; 7,397 shares in 2017 and 7,402 in 2016, respectively	(124,102)	(124,182)
Stockholders' Equity Attributable to Parent	518,245	505,826
Liabilities and Stockholders' Equity	$ 751,709	$ 738,228