Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
OPERATING REVENUES:
Revenue, before fuel surcharge	$ 80,606	$ 80,657	$ 155,502	$ 158,485
Fuel surcharge	23,737	23,751	46,662	45,904
Total operating revenues	104,343	104,408	202,164	204,389
OPERATING EXPENSES AND COSTS:
Salaries, wages and benefits	27,032	27,386	53,067	54,781
Fuel expense	23,425	24,232	48,223	51,202
Rent and purchased transportation	21,957	22,194	42,719	42,291
Depreciation	9,167	9,766	18,292	19,860
Operating supplies and expenses	8,156	8,812	16,349	17,661
Operating taxes and licenses	1,117	1,230	2,292	2,501
Insurance and claims	3,908	3,810	7,650	7,248
Communications and utilities	585	519	1,209	1,120
Other	1,928	1,666	3,715	3,326
Gain on disposition of equipment	(1,521)	(213)	(2,787)	(355)
Total operating expenses and costs	95,754	99,402	190,729	199,635
OPERATING INCOME	8,589	5,006	11,435	4,754
NON-OPERATING INCOME	259	289	530	573
INTEREST EXPENSE	(743)	(880)	(1,605)	(1,695)
INCOME BEFORE INCOME TAXES	8,105	4,415	10,360	3,632
FEDERAL AND STATE INCOME TAX EXPENSE:
Current	496		616
Deferred	2,664	1,733	3,442	1,406
Total federal and state income tax expense	3,160	1,733	4,058	1,406
NET INCOME	$ 4,945	$ 2,682	$ 6,302	$ 2,226
INCOME PER COMMON SHARE:
Basic (in Dollars per share)	$ 0.62	$ 0.31	$ 0.79	$ 0.26
Diluted (in Dollars per share)	$ 0.62	$ 0.31	$ 0.78	$ 0.26
AVERAGE COMMON SHARES OUTSTANDING:
Basic (in Shares)	7,992	8,658	7,989	8,673
Diluted (in Shares)	8,035	8,659	8,033	8,675