Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
OPERATING REVENUES:
Revenue, before fuel surcharge	$ 93,097	$ 98,921	$ 186,700	$ 192,570
Fuel surcharge	15,549	12,595	31,350	22,535
Total operating revenues	108,646	111,516	218,050	215,105
OPERATING EXPENSES AND COSTS:
Salaries, wages and benefits	25,263	27,841	51,167	55,324
Operating supplies and expenses	19,410	21,042	39,642	40,160
Rent and purchased transportation	43,717	40,718	86,839	78,105
Depreciation	10,485	9,668	21,156	18,845
Insurance and claims	4,439	4,491	9,135	8,549
Other	2,304	2,014	4,421	4,184
Loss (gain) on disposition of equipment	130	(1,612)	130	(3,002)
Total operating expenses and costs	105,748	104,162	212,490	202,165
OPERATING INCOME	2,898	7,354	5,560	12,940
NON-OPERATING INCOME (EXPENSE)	650	(10)	2,702	(32)
INTEREST EXPENSE	(935)	(910)	(1,912)	(1,732)
INCOME BEFORE INCOME TAXES	2,613	6,434	6,350	11,176
FEDERAL AND STATE INCOME TAX EXPENSE:
Current	66	28	133	52
Deferred	938	2,414	2,325	4,197
Total federal and state income tax expense	1,004	2,442	2,458	4,249
NET INCOME	$ 1,609	$ 3,992	$ 3,892	$ 6,927
INCOME PER COMMON SHARE:
Basic (in dollars per share)	$ 0.25	$ 0.61	$ 0.61	$ 1.01
Diluted (in dollars per share)	$ 0.25	$ 0.61	$ 0.61	$ 1.01
AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	6,381	6,551	6,390	6,836
Diluted (in shares)	6,430	6,572	6,412	6,858