Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
OPERATING REVENUES:
Revenue, before fuel surcharge	$ 316,584	$ 313,117	$ 297,698
Fuel surcharge	94,353	89,696	82,935
Total operating revenues	410,937	402,813	380,633
OPERATING EXPENSES AND COSTS:
Salaries, wages and benefits	108,371	107,037	108,866
Operating supplies and expenses	126,875	137,268	155,392
Rents and purchased transportation	90,831	85,226	54,011
Depreciation	36,296	39,088	38,298
Insurance and claims	20,274	14,586	13,744
Other	9,871	8,956	7,585
Gain on disposition of equipment	(4,591)	(854)	(166)
Total operating expenses and costs	387,927	391,307	377,730
OPERATING INCOME	23,010	11,506	2,903
NON-OPERATING INCOME	2,099	1,540	3,288
INTEREST EXPENSE	(2,897)	(3,375)	(2,596)
INCOME BEFORE INCOME TAXES	22,212	9,671	3,595
FEDERAL & STATE INCOME TAX EXPENSE:
Current	1,209	159	51
Deferred	7,512	3,597	1,365
Total federal & state income tax expense	8,721	3,756	1,416
NET INCOME	$ 13,491	$ 5,915	$ 2,179
EARNINGS PER COMMON SHARE:
Basic (in Dollars per share)	$ 1.69	$ 0.68	$ 0.25
Diluted (in Dollars per share)	$ 1.68	$ 0.68	$ 0.25
AVERAGE COMMON SHARES OUTSTANDING:
Basic (in Shares)	7,990	8,662	8,700
Diluted (in Shares)	8,034	8,682	8,702
DIVIDENDS DECLARED PER COMMON SHARE (in Dollars per share)			$ 2.00