Consolidated Condensed Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenue:
Freight revenue	$ 134,220	$ 133,630	$ 256,120	$ 258,048
Fuel surcharge revenue	37,081	39,235	72,212	71,208
Total revenue	171,301	172,865	328,332	329,256
Operating expenses:
Salaries, wages, and related expenses	53,396	54,474	105,558	106,215
Fuel expense	48,217	56,301	96,572	106,973
Operations and maintenance	11,256	10,715	21,667	20,888
Revenue equipment rentals and purchased transportation	22,000	15,459	39,178	29,436
Operating taxes and licenses	3,037	3,014	5,434	6,116
Insurance and claims	6,133	11,193	15,989	19,883
Communications and utilities	1,176	1,248	2,375	2,583
General supplies and expenses	3,846	3,981	7,598	7,849
Depreciation and amortization, including gains and losses on disposition of equipment	11,181	9,246	20,545	21,778
Total operating expenses	160,242	165,631	314,916	321,721
Operating income	11,059	7,234	13,416	7,535
Other (income) expenses:
Interest expense	3,355	3,926	6,873	8,022
Interest income	0	(10)		(32)
Other (income) expense, net	(5)	(15)	(15)	(43)
Other expenses, net	3,350	3,901	6,858	7,947
Equity in income of affiliate	425	125	670	125
Income (loss) before income taxes	8,134	3,458	7,228	(287)
Income tax expense	3,883	1,803	3,617	522
Net income (loss)	$ 4,251	$ 1,655	$ 3,611	$ (809)
Basic net income (loss) per share (in Dollars per share)	$ 0.29	$ 0.11	$ 0.25	$ (0.06)
Diluted net income (loss) per share (in Dollars per share)	$ 0.29	$ 0.11	$ 0.24	$ (0.06)
Basic weighted average shares outstanding (in Shares)	14,732	14,702	14,727	14,657
Diluted weighted average shares outstanding (in Shares)	14,787	14,833	14,796	14,657