Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
CURRENT ASSETS
Cash and cash equivalents	$ 51,291	$ 128,507
Trade receivables, net	70,755	46,844
Prepaid tires	11,462	8,181
Other current assets	30,656	13,841
Income tax receivable	7,558	4,738
Total current assets	171,722	202,111
PROPERTY AND EQUIPMENT
Land and land improvements	40,283	39,356
Buildings	48,657	48,371
Leasehold improvements	2,208	1,703
Furniture and fixtures	3,060	2,096
Shop and service equipment	12,213	11,009
Revenue equipment	588,609	556,464
Construction in progress	1,429	54
Property, Plant and Equipment, Gross	696,459	659,053
Less accumulated depreciation	242,181	251,405
Property and equipment, net	454,278	407,648
GOODWILL	132,185	100,212
OTHER INTANGIBLES, NET	15,030	12,090
Deferred Income Taxes, Net	1,658	3,785
OTHER ASSETS	22,821	12,382
Assets	797,694	738,228
CURRENT LIABILITIES
Accounts payable and accrued liabilities	26,411	12,355
Compensation and benefits	28,194	23,320
Insurance accruals	24,141	19,132
Other accruals	13,647	10,727
Total current liabilities	92,393	65,534
LONG-TERM LIABILITIES
Income taxes payable	7,739	11,954
Deferred income taxes, net	95,695	94,657
Insurance accruals less current portion	64,331	60,257
Total long-term liabilities	167,765	166,868
COMMITMENTS AND CONTINGENCIES (Note 15)
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 83,303 in 2017 and 83,287 in 2016, respectively	907	907
Additional paid-in capital	3,347	3,433
Retained earnings	657,236	625,668
Treasury stock, at cost; 7,386 shares in 2017 and 7,402 in 2016, respectively	(123,954)	(124,182)
Stockholders' Equity Attributable to Parent	537,536	505,826
Liabilities and Stockholders' Equity	$ 797,694	$ 738,228