Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
CURRENT ASSETS
Cash and cash equivalents	$ 77,607	$ 33,232
Trade receivables, net	57,009	61,009
Prepaid tires	8,793	9,584
Other current assets	11,468	8,316
Income tax receivable	7,773	7,641
Deferred income taxes, net	0	16,662
Total current assets	162,650	136,444
PROPERTY AND EQUIPMENT
Land and land improvements	39,258	37,899
Buildings	48,372	47,837
Leasehold improvements	1,703	1,703
Furniture and fixtures	2,096	2,096
Shop and service equipment	10,717	10,917
Revenue equipment	573,994	571,281
Construction in progress	30	213
Property, Plant and Equipment, Gross	676,170	671,946
Less accumulated depreciation	225,482	197,948
Property and equipment, net	450,688	473,998
GOODWILL	100,212	100,212
OTHER INTANGIBLES, NET	13,051	14,013
DEFERRED INCOME TAXES, NET	4,222	0
OTHER ASSETS	11,266	11,363
Assets	742,089	736,030
CURRENT LIABILITIES
Accounts payable and accrued liabilities	21,535	7,516
Compensation and benefits	25,667	24,636
Insurance accruals	22,330	21,573
Other accruals	13,040	12,443
Total current liabilities	82,572	66,168
LONG-TERM LIABILITIES
Income taxes payable	12,433	16,228
Deferred income taxes, net	94,337	112,118
Insurance accruals less current portion	61,420	59,435
Other long-term liabilities	8,000	12,153
Total long-term liabilities	176,190	199,934
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 2016 and 2015; outstanding 83,279 in 2016 and 84,115 in 2015, respectively	907	907
Additional paid-in capital	3,378	4,126
Retained earnings	603,361	575,948
Treasury stock, at cost; 7,410 shares in 2016 and 6,574 in 2015, respectively	(124,319)	(111,053)
Stockholders' Equity Attributable to Parent	483,327	469,928
Liabilities and Stockholders' Equity	$ 742,089	$ 736,030